Windows, Premiere 25.4, "IOError: I/O error" when loading extensions

[Ivan Stepanov]

I'm getting user reports that when they opening Premiere Pro 25.4 on Windows, they get these errors

For now it happens to Excalibur and Chronicler users.

I presume this is related to script loading, I use this approach, where main script is loaded at the start and then it evaluates all other extendscript files.

If user rolls back to 25.3, error goes away.

Are there any similar reports from anyone else, are there any changes in Premiere 25.4 on Windows?

My apologies, but I can not replicate this issue on my machine, as I don't have access to Premiere 25.4 on Windows at the moment (Macbook M chip). Otherwise I would provide more details.

[bbb_999]

> I use this approach,

So does PProPanel! 🙂

For the users that see this behavior, how was the extension installed? [I'm thinking maybe file system privileges, or something, is impacting the behavior]

[Ivan Stepanov]

they use installer executable that I provide.

It basically moves extension inside CEP folder.

For Chronicler it is:

C:\Program Files\Common Files\Adobe\CEP\extensions\knights_of_the_editing_table.chronicler

For Excalibur it is still:

C:\Users\%username%\AppData\Roaming\Adobe\CEP\extensions\knights_of_the_editing_table.excalibur

[bbb_999 · Accepted solution]

I propose that you introduce me (via email) to one of the users who can reliably reproduce the behavior.