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Error 0x00000742 does not have one universal Windows meaning. In Beckhoff TwinCAT or another ADS client, hexadecimal 0x742 (decimal 1858) is ADSERR_CLIENT_LISTEMPTY, meaning “Polling list is empty.” A printer dialog showing 0x00000742 may instead reflect a spooler, driver, or application problem; Microsoft’s printer guidance does not define this code as a standard Windows error. Identify the program that displayed the message first, then follow the TwinCAT/ADS or printing procedure below. The full Beckhoff HRESULT is 0x98110742, but a screen showing only 0x00000742 may be displaying the low-order value, so confirm the source application before changing settings.
What does error 0x00000742 mean?
The strongest documented match is Beckhoff’s ADS return code 0x742 (1858), named ADSERR_CLIENT_LISTEMPTY or ClientListEmpty. Its description is “Polling list is empty.” This is a client-side TwinCAT/ADS condition: the client attempted to poll a list that contains no usable entries.
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Beckhoff documents the corresponding full HRESULT as 0x98110742. A program that displays 0x00000742 may be showing only the low-order portion or may be formatting its own application error. That relationship is an inference, not a Microsoft mapping. The window title, application name, and surrounding text are therefore more useful than the number alone.
Microsoft’s Windows 10 and Windows 11 printer support articles describe queue, spooler, driver, and application failures, but do not establish 0x00000742 as a universal Windows printing code. Treating every occurrence as a TwinCAT problem—or every occurrence as a printer problem—can make the original fault harder to find.
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How can I identify which fix applies?
Use the process that displayed the message to choose the branch. Do not edit the registry or install a repair utility until you know whether the failing layer is ADS configuration, the Windows print pipeline, or one application.
| Where the message appears | Most likely layer | First action |
|---|---|---|
| TwinCAT, an ADS client, or an engineering application | Empty polling or notification list, or unavailable symbols | Inspect the client’s configured list and symbol availability |
| Printer queue, print dialog, or Windows printer setup | Queued job, Print Spooler state, driver, or printer registration | Clear the queue and restart Print Spooler |
| Only one program while other programs print | Application settings, document, or Office installation | Test another file and another application, then repair the affected app if needed |
Record the exact message, the application name, whether the code is shown as 0x742 or 0x00000742, and what action triggered it. If the message is in an event log, preserve the event source and full text. These details let Beckhoff or the printer manufacturer distinguish an ADS code from an unrelated application-rendered number.
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteHow do I fix 0x00000742 in TwinCAT or an ADS client?
In TwinCAT/ADS, the documented condition is an empty polling list. The practical repair is to restore a valid list of symbols or notifications and then retry the client. Exact menu names vary by TwinCAT generation and by the ADS library used, so use the concepts below rather than assuming a particular dialog exists.
1. Open the client configuration that owns the list
Start with the application that raised the message, not with Windows system settings. Find its polling, cyclic-read, notification, subscription, or symbol-watch configuration. Some clients build the list in a project file; others create it in code when a session starts. If a service or scheduled task owns the connection, make the change in that service’s project or configuration.
2. Check that the list contains entries
Look for an empty collection, a disabled item, or a list that was cleared during a configuration edit. A list can appear populated while every entry is invalid, so inspect each symbol or variable rather than relying on a row count. Save a backup of the project or configuration before changing it.
3. Verify that requested symbols still exist
Confirm that every variable name, instance path, and data type still exists in the PLC or target runtime. Online changes can rename, move, delete, or make symbols unavailable. Re-add the current symbols through the client’s browser or symbol-selection tool when possible instead of typing old paths by hand.
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4. Check the target connection and availability
Make sure the ADS route, target device, and runtime are online and that the account has the access required by the client. A disconnected target can prevent a list from becoming usable even when the configuration file still contains entries. Resolve connection or target-state warnings first, then refresh the symbol list.
5. Save, restart the client, and retry
After correcting the list, save the configuration and restart the ADS client or service so it rebuilds its subscriptions. Retry the operation that produced the message. If the list is repopulated and the target is online, the 0x742 condition should no longer be the immediate response; a different code may expose a separate connection or symbol problem.
6. Escalate with complete context
If the list is populated and symbols are available but the client still returns the code, contact Beckhoff or the maintainer of the ADS library. Provide the TwinCAT version, client-library version, target runtime state, full error text or HRESULT, a sanitized list of the requested symbols, and the configuration change that preceded the failure. Avoid deleting project files or changing PLC variables merely to suppress the message.
How do I fix 0x00000742 when it appears while printing?
For a printing symptom, follow Microsoft’s standard recovery sequence: remove stuck jobs, restart Print Spooler, clean up obsolete drivers, install the current driver from the printer manufacturer, and reinstall the printer if necessary. Perform the steps in order so you can tell whether the queue, service, driver, or application was responsible.
1. Cancel every job in the printer queue
- On Windows 11, open Settings > Bluetooth & devices > Printers & scanners. On Windows 10, open Settings > Devices > Printers & scanners.
- Select the affected printer and open its print queue.
- Cancel each pending document, including jobs submitted by other users if you have permission. Wait for the queue to show no remaining jobs.
A single damaged or stalled document can keep later jobs from starting. If a job will not cancel, continue to the spooler restart rather than repeatedly submitting the same document.
2. Restart the Print Spooler service
- Press
Win+R, typeservices.msc, and press Enter. - Find Print Spooler.
- Right-click it and choose Restart. If it is stopped, choose Start.
- Reopen the printer queue and confirm that the canceled jobs have disappeared before submitting a new one.
Microsoft notes that conflicting drivers are a common cause of spooler crashes. If the service stops again as soon as a printer is selected, suspect a driver or printer registration rather than the document itself.
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3. Remove unnecessary or duplicate printer drivers
In Settings > Bluetooth & devices > Printers & scanners (Windows 11) or Settings > Devices > Printers & scanners (Windows 10), remove old, duplicate, or unused printer entries. Keep the printer you actually use and note its exact model. If Windows presents a choice to remove the associated driver package, remove a package only when you are sure no other printer depends on it; shared packages can serve several models.
After removal, restart Print Spooler again. If the spooler remains stable without the old entry, the duplicate registration was part of the failure. Do not delete arbitrary files from Windows system folders or registry keys to force a removal.
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Use the manufacturer’s support page for the exact printer model and your Windows edition. Choose the current Windows 11 or Windows 10 package offered for that model, and follow the vendor’s installation instructions. Avoid selecting a similarly named model or a generic package when the manufacturer provides a model-specific driver. Disconnecting and reconnecting the printer during setup may be required for USB devices; network printers may need their address or discovery step repeated.
5. Reinstall the printer in Windows
- Return to the printer list in Settings > Bluetooth & devices > Printers & scanners on Windows 11, or Settings > Devices > Printers & scanners on Windows 10.
- Select the failed printer, choose Remove, and confirm.
- Restart Windows if the driver installer requests it, then use Add device to add the printer again.
- Open the printer’s management page and print a Windows test page.
A successful Windows test page shows that the basic queue, spooler, driver, and connection are functioning. If the test page fails, continue troubleshooting the printer connection or driver rather than changing document settings.
What if only one application cannot print?
When another application can print to the same device, the Windows print path is probably working and the fault is local to the failing program, its document, or its settings.
Test the printer and document separately
- Print a simple file from a different application to the same printer.
- In the failing application, verify that the intended printer is selected and that paper size, orientation, tray, and page range are valid.
- Try a new blank document or a different file. A damaged document can fail while ordinary files print normally.
- Print a Windows test page to separate application behavior from driver behavior.
Repair Microsoft 365 or Office when applicable
If the failure is limited to a Microsoft 365 or Office program, use Windows’ installed-app repair controls. Choose Quick Repair first. If that does not restore printing, run Online Repair, which reinstalls more of the Office installation and may take longer. Save work and close Office programs before starting either repair.
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Retry after the spooler and driver checks
Even an app-specific failure can leave a job stuck or cause the spooler to crash. Clear the queue and restart Print Spooler before testing again. If only one application continues to show 0x00000742 while the Windows test page and other programs work, record that application’s version and exact message for its support channel.
Is 0x00000742 a Windows 10 or Windows 11 system error?
It is not established as a universal Windows system code. The documented 0x742 meaning comes from Beckhoff ADS, while Microsoft’s printer guidance addresses the surrounding components without assigning this number to Windows itself. The same eight-digit display can therefore represent different application-level conditions.
Microsoft states that support for Windows 10 ended on October 14, 2025. The Windows 10 procedures above still describe the locations of printer settings, but Windows 10 no longer receives free security fixes, software updates, or technical assistance from Microsoft. A supported Windows 11 installation may provide a more current driver and troubleshooting path when the hardware meets its requirements; changing operating systems is not, by itself, a fix for an empty ADS polling list.
What should I avoid while troubleshooting?
- Do not assume the number identifies the cause. Confirm the originating process and full message first.
- Do not remove registry entries at random. The documented remedies concern ADS lists, queue state, spooler operation, drivers, and application repair.
- Do not install a generic driver over a model-specific one without checking compatibility. Use the printer manufacturer’s current package for the exact model.
- Do not keep resubmitting a stuck print job. Cancel the queue and restart Print Spooler before testing again.
- Do not delete shared drivers blindly. An apparently unused package may serve another printer on the computer.
- Do not treat a successful test page as proof that every application is fixed. It confirms the basic Windows print path; app-specific settings can still fail.
Which branch should I follow first?
Use this sequence when the source is unclear:
- Capture the window title, application name, full text, and whether the value is 0x742, 0x00000742, or 0x98110742.
- If the source is TwinCAT or an ADS client, inspect and repopulate the polling or notification list, verify symbols, and retry.
- If the source is a printer workflow, clear queued jobs, restart Print Spooler, remove obsolete drivers, install the manufacturer’s driver, and reinstall the printer if needed.
- If only one application fails, test another application and a Windows test page, then repair that application when appropriate.
- If none of these identifies the failing layer, send the captured details to the application vendor, Beckhoff, or the printer manufacturer instead of applying unrelated system cleaners.
As an optional shortcut after the manual checks, Outbyte PC Repair can look for certain broken Windows elements, invalid redirects, shared DLL issues, and app-crash records, while also offering cleanup and settings tools. It runs on Windows 11, 10, 8, and 7; its free trial is provided by category for at least two days before a subscription. It complements antivirus software rather than replacing it, results vary, and no tool repairs every crash.
Frequently asked questions
Is 0x742 the same as 0x00000742?
They contain the same hexadecimal low-order value, but an application may attach different context or a larger HRESULT. Beckhoff’s documented full value is 0x98110742, so keep the complete code and message when requesting support.
What information does Beckhoff support need for this error?
Include the TwinCAT and ADS client versions, target runtime state, the exact full error text, and a sanitized export or screenshot of the polling and notification configuration. Mention any symbol rename, project download, or route change immediately before the failure.
Can a printer cable or replacement part fix this code?
The documented printing path points first to queue state, Print Spooler, driver conflicts, printer registration, and application settings. Hardware replacement is not indicated by the code alone; establish that the Windows test page and connection fail after the software steps before considering a physical fault.
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Why does printing work from one program but not another?
Different programs can use different page settings, rendering paths, or Office components even when they share the same Windows printer. A successful test page and a successful print from another application narrow the problem to the failing program or document.
Should I keep using Windows 10 for this troubleshooting?
The printer menu paths remain available, but Microsoft support for Windows 10 ended on October 14, 2025. For security and ongoing driver support, plan a supported Windows version when your hardware and software allow it; that decision is separate from correcting the immediate ADS or printing condition.
Frequently Asked Questions
Is 0x742 the same as 0x00000742?
They contain the same hexadecimal low-order value, but an application may attach different context or a larger HRESULT. Beckhoff’s documented full value is 0x98110742, so keep the complete code and message when requesting support.
What information does Beckhoff support need for this error?
Include the TwinCAT and ADS client versions, target runtime state, the exact full error text, and a sanitized export or screenshot of the polling and notification configuration. Mention any symbol rename, project download, or route change immediately before the failure.
Can a printer cable or replacement part fix this code?
The documented printing path points first to queue state, Print Spooler, driver conflicts, printer registration, and application settings. Hardware replacement is not indicated by the code alone; establish that the Windows test page and connection fail after the software steps before considering a physical fault.
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Why does printing work from one program but not another?
Different programs can use different page settings, rendering paths, or Office components even when they share the same Windows printer. A successful test page and a successful print from another application narrow the problem to the failing program or document.
Should I keep using Windows 10 for this troubleshooting?
The printer menu paths remain available, but Microsoft support for Windows 10 ended on October 14, 2025. For security and ongoing driver support, plan a supported Windows version when your hardware and software allow it; that decision is separate from correcting the immediate ADS or printing condition.
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