Try each of these steps and see if they fix the problem:
First, look at the error and see if it gives you enough information to understand why it's happening. If not, try each of these steps and see if they fix the problem:
Go to your profile settings, click Advanced, and check "Apply brightness/contrast after scan".
Go to your profile settings, click Advanced, and try checking "Offset width based on alignment (WIA)".
Go to your profile settings, click Advanced, and check "Stretch to page size".
Go to your profile settings, click Advanced, and check "Crop to page size".
Go to your profile settings, click Advanced, and check "Flip duplexed pages".
If NAPS2 gives you an error message, you may be able to find more details in the error log.
For installed versions of NAPS2, the error log is located at:
%APPDATA%\NAPS2\errorlog.txt
For example, if your Windows username is John, it would be:
C:\Users\John\AppData\Roaming\NAPS2\errorlog.txt
For portable versions of NAPS2, the errorlog.txt file is located in the Data folder.
If you are technically inclined, you can look at the contents of the errorlog.txt file yourself to try and determine the issue. If you need help with it, or think the error is a bug in NAPS2, you can file a ticket and upload the error log as part of the ticket.
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