Strange error: This operation is not allowed, since scanning is in progress.

[mbmast]

Using the Optimize Document wizard, I'm getting a lot of "This operation is not allowed, since scanning is in progress" errors.

This is a confusing message.  It sounds like Acrobat Pro is telling me it can't scan the document becuase it's busy scanning the document.  What is really going on?

Here's the full message:

[-]WI Commitment.pdf(Failed)

1. Optimize Scanned Pages

   Command Name: Optimize Scanned Pages
   Command Start Time:	2023-01-24 12:01:13
   reportType: Error
   errorCode: 0
   message: This operation is not allowed, since scanning is in progress.
   reportType: Error
   errorCode: 0
   message: Scanned Image Optimization failed processing this page
   Command Status: Failed

2. Save

   Command Name: Save
   Command Start Time:	2023-01-24 12:01:13
   Command Status: Succeeded
   Command Finish Time:	2023-01-24 12:01:13

[mbmast]

There's more.  When I try to close Acrobat, I get this:

[Andrew340570276lzt]

Same problem. But seem to have fixed it the following way:

Open the Windows Command prompt by typing cmd into the search box

In the command prompt window, type the following (omitting the inverted commas) "taskkill /im acrobat.exe /f /t". Then hit the Return or Enter key.

It should shut Acrobat down and when you restart it, the problem will not come back