naps2
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cyanfish
Scan always aborts with no error apparent
Describe the bug Scan starts, gets partway through, then stops in the middle. Scanner returns to rest position. No page is shown and no error pops up.
To Reproduce Steps to reproduce the behavior:
- Attempt any page scan
- Watch progress popup and listen to scanner whirring through part of the page
- It stops early
- The progress popup proceeds for a little while longer, then goes away
- No page image is shown and there's no complaint about anything from NAPS2
Expected behavior A page to be added in the main window
Screenshots If applicable, add screenshots to help explain your problem.
Desktop (please complete the following information):
- Windows 11 Pro
- NAPS2 Version 8.1.4.0
Additional context
Output in errorlog.txt:
2025-04-23 04:45:16.0664 32364 Error in invoked action System.NullReferenceException: Object reference not set to an instance of an object.
at ReturnCode NTwain.Triplets.PendingXfers.EndXfer(TWPendingXfers pendingXfers)
at void NTwain.Internals.TransferLogic.DoTransferRoutine(ITwainSessionInternal session)
at void NTwain.TwainSession.HandleSourceMsg(Message msg)
at ReturnCode NTwain.TwainSession.HandleCallback(TWIdentity origin, TWIdentity destination, DataGroups dg, DataArgumentType dat, Message msg, IntPtr data)+() => { } [1]
at void NAPS2.Platform.Windows.Win32MessagePump.RunQueuedActions()
Output in debuglog.txt:
2025-04-23 04:43:51.1361 37776 Scanning with ScanDevice { Driver = Twain, ID = Kyocera MA2000w (Net) (1), Name = Kyocera MA2000w (Net) (1), IconUri = }
2025-04-23 04:43:51.1361 37776 Scan source: Flatbed; bit depth: Color; dpi: 600; page size: 8.5x11 in
2025-04-23 04:43:51.2806 32364 Debug: Using new dsm.
2025-04-23 04:43:51.3268 32364 Using TWAIN DSM: C:\Program Files\NAPS2\lib\_win32\twaindsm.dll
2025-04-23 04:43:51.3268 32364 NAPS2.TW - Opening session
2025-04-23 04:43:51.3268 32364 Debug: Thread 1: OpenManager.
2025-04-23 04:43:51.3421 32364 NAPS2.TW - StateChanged (to 3)
2025-04-23 04:43:51.3421 32364 Debug: Using TWAIN2 memory functions.
2025-04-23 04:43:51.3421 32364 NAPS2.TW - Finding source
2025-04-23 04:43:51.3421 32364 Debug: Source id = 1
2025-04-23 04:43:51.3421 32364 NAPS2.TW - Opening source
2025-04-23 04:43:51.3572 32364 NAPS2.TW - Name: Kyocera MA2000w (Net) (1); Manu: TWAIN Working Group; Family: KYOCERA CORPORATION; Version: 3.0 Version 2.000; Protocol: 1.8
2025-04-23 04:43:51.3572 32364 Debug: Thread 1: OpenSource.
2025-04-23 04:43:51.3572 32364 NAPS2.TW - StateChanged (to 4)
2025-04-23 04:43:51.3572 32364 Debug: Registered callback2 OK.
2025-04-23 04:43:51.3572 32364 NAPS2.TW - Configuring source
2025-04-23 04:43:51.3572 32364 Defaulting to Memory transfer mode.
2025-04-23 04:43:51.3572 32364 Transfer mode: Memory
2025-04-23 04:43:51.3849 32364 NAPS2.TW - Enabling source
2025-04-23 04:43:51.3849 32364 Debug: Thread 1: EnableSource with NoUI.
2025-04-23 04:43:53.1024 32364 NAPS2.TW - StateChanged (to 5)
2025-04-23 04:45:11.8677 32364 Debug: Thread 1: CallbackHandler at state 5 with MSG=XferReady.
2025-04-23 04:45:11.8702 32364 Debug: Got TWAIN msg XferReady
2025-04-23 04:45:11.8702 32364 NAPS2.TW - StateChanged (to 6)
2025-04-23 04:45:15.4689 32364 Debug: Trying to raise event TransferReadyEventArgs on thread 1 without sync.
2025-04-23 04:45:15.4689 32364 NAPS2.TW - TransferReady
2025-04-23 04:45:15.4775 32364 Debug: Trying to raise event TransferErrorEventArgs on thread 1 without sync.
2025-04-23 04:45:15.4775 32364 NAPS2.TW - TransferError
2025-04-23 04:45:15.4775 32364 NAPS2.TW - Finishing with error NAPS2.Scan.Exceptions.AlreadyHandledDriverException: Exception of type 'NAPS2.Scan.Exceptions.AlreadyHandledDriverException' was thrown.
2025-04-23 04:45:15.4775 32364 Debug: Thread 1: ForceStepDown.
2025-04-23 04:45:15.9942 32364 Debug: Thread 1: DisableSource.
2025-04-23 04:45:16.0664 32364 Debug: Thread 1: CallbackHandler at state 6 with MSG=CloseDSReq.
2025-04-23 04:45:16.0664 32364 NAPS2.TW - StateChanged (to 4)
2025-04-23 04:45:16.0664 32364 NAPS2.TW - SourceDisabled
2025-04-23 04:45:16.0664 32364 Debug: Thread 1: CloseSource.
2025-04-23 04:45:16.0664 32364 NAPS2.TW - StateChanged (to 3)
2025-04-23 04:45:16.0664 32364 Debug: Thread 1: CloseManager.
2025-04-23 04:45:16.0664 32364 NAPS2.TW - StateChanged (to 2)
2025-04-23 04:45:16.0664 32364 NAPS2.TW - StateChanged (to 6)
2025-04-23 04:45:16.0664 32364 Error in invoked action System.NullReferenceException: Object reference not set to an instance of an object.
at ReturnCode NTwain.Triplets.PendingXfers.EndXfer(TWPendingXfers pendingXfers)
at void NTwain.Internals.TransferLogic.DoTransferRoutine(ITwainSessionInternal session)
at void NTwain.TwainSession.HandleSourceMsg(Message msg)
at ReturnCode NTwain.TwainSession.HandleCallback(TWIdentity origin, TWIdentity destination, DataGroups dg, DataArgumentType dat, Message msg, IntPtr data)+() => { } [1]
at void NAPS2.Platform.Windows.Win32MessagePump.RunQueuedActions()
2025-04-23 04:45:16.0981 32364 Debug: Got TWAIN msg CloseDSReq
2025-04-23 04:45:16.0981 32364 NAPS2.TW - Finishing with completion
2025-04-23 04:45:16.0981 32364 Debug: Thread 1: ForceStepDown.
2025-04-23 04:46:11.1292 31552 Debug: Using new dsm.
2025-04-23 04:46:11.1798 31552 Debug: Thread 1: OpenManager.
2025-04-23 04:46:11.1906 31552 Debug: Using TWAIN2 memory functions.
2025-04-23 04:46:11.1906 31552 Debug: Source id = 1
2025-04-23 04:46:11.1906 31552 Debug: Thread 1: CloseManager.
2025-04-23 04:48:49.6767 37972 Debug: Using new dsm.
2025-04-23 04:48:49.7260 37972 Debug: Thread 1: OpenManager.
2025-04-23 04:48:49.7366 37972 Debug: Using TWAIN2 memory functions.
2025-04-23 04:48:49.7366 37972 Debug: Source id = 1
2025-04-23 04:48:49.7366 37972 Debug: Thread 1: CloseManager.
2025-04-23 04:48:51.9674 36080 Debug: Using new dsm.
2025-04-23 04:48:52.0148 36080 Debug: Thread 1: OpenManager.
2025-04-23 04:48:52.0253 36080 Debug: Using TWAIN2 memory functions.
2025-04-23 04:48:52.0253 36080 Debug: Source id = 1
2025-04-23 04:48:52.0253 36080 Debug: Thread 1: CloseManager.
2025-04-23 04:48:53.5130 38648 Debug: Using new dsm.
2025-04-23 04:48:53.5597 38648 Debug: Thread 1: OpenManager.
2025-04-23 04:48:53.5597 38648 Debug: Using TWAIN2 memory functions.
2025-04-23 04:48:53.5723 38648 Debug: Source id = 1
2025-04-23 04:48:53.5723 38648 Debug: Thread 1: CloseManager.
2025-04-23 04:48:55.0826 21200 Debug: Using new dsm.
2025-04-23 04:48:55.1315 21200 Debug: Thread 1: OpenManager.
2025-04-23 04:48:55.1421 21200 Debug: Using TWAIN2 memory functions.
2025-04-23 04:48:55.1421 21200 Debug: Source id = 1
2025-04-23 04:48:55.1421 21200 Debug: Thread 1: CloseManager.
In your profile settings, under Advanced, Twain Implementation, if you select "Native Transfer" does it make a difference?
