[ID-4264967] ExternalObject("lib:PlugPlugExternalObject") now throw an “I/O Error”
IOError: I/O error occurs when calling new ExternalObject("lib:\PlugPlugExternalObject") after updating to InDesign 20.4 on macOS 15.
vindux
shared this idea
The fix of the issue is now available in the latest InDesign 2025(v20.4.1.004). We recommend you upgrade to the latest version for the fix.
If you are unable to see the update, go to the Creative Cloud application click on the context menu on the top right, and click on Check for App Updates.
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Adobe InDesign Team
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vindux
commented
I tested the new InDesign pre-release, and the issue seems to be fixed.
Thank you for the quick hotfix!
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Phantom Steve
commented
This is unexpected. How does this get past Quality Control?
It's a major bug introduced by an update. You need to post a warning on the CC App.
Now I have to spend my time going back a version.Just to confirm — going back to 20.3.1 restores functionality.