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Participant
June 16, 2025
Answered

CEP Plugin : IOError when loading PlugPlugExternalObject in 20.4

  • June 16, 2025
  • 3 replies
  • 520 views

Hello,

 

We have an InDesign plugin on the marketplace and all our MacOS users who updated to Indesign 20.4 has an error at plugin launch "IOError: I/O error".
The error comes from this line that has been in the plugin for 8 years without any issue:

xLib = new ExternalObject("lib:\PlugPlugExternalObject");

From what I found, this is still the standard way to load this library.

I've tried to remove the \ but it did not change anything, at least when building locally.

 

Does anyone else have the same issue since the update ?
Is it a known issue ?

Correct answer Abhishek Rao

Hi everyone,

 

Just wanted to share an update that the issue with PlugPlugExternalObject and the resulting I/O error has been addressed in the InDesign 20.4.1 update. If you haven't updated yet, we recommend giving this version a try.

 

Please let us know if the problem persists after updating, we'll be happy to assist further!

Abhishek

3 replies

Abhishek Rao
Community Manager
Abhishek RaoCommunity ManagerCorrect answer
Community Manager
June 25, 2025

Hi everyone,

 

Just wanted to share an update that the issue with PlugPlugExternalObject and the resulting I/O error has been addressed in the InDesign 20.4.1 update. If you haven't updated yet, we recommend giving this version a try.

 

Please let us know if the problem persists after updating, we'll be happy to assist further!

Abhishek

Community Expert
June 17, 2025

Hi @a.cavoleau,

Seems this is getting reported by others as well. See https://community.adobe.com/t5/indesign-discussions/csxs-event-warning/m-p/15372744#M628319

-Manan

-Manan
Charu Rajput
Community Expert
Community Expert
June 16, 2025

Hi @a.cavoleau 

This is a known bug in the latest version of InDesign and has already been reported. Unfortunately, it has reappeared in the most recent release.

Best regards