After Effects error: internal verification failure, sorry! {invalid index in indexed group}

[Antianything]

Currently, I am engrossed in a project, and during the precomposing phase, I encountered an error message indicating the presence of special characters within my compositions. Although this type of issue has occurred before in After Effects, it typically disappears after clicking "OK" a few times. However, this time, despite using an auto clicker for an extended period, the error message persists without any resolution. Given that I haven't saved my project recently, I am hesitant to close After Effects. My primary concern is finding a way to resolve this error promptly to facilitate necessary fixes. Any assistance in resolving this matter would be greatly appreciated.

Version: 2020
Platform: PC

[Mylenium]

Nobody can tell you anything based on such broasd and generic information. from an expression breaking down to a specific effect losing a reference to a layer this could be anything. Either way, you need to be much more specific. As a start enable capslock to suppress rendering/ evaluation and see if it somehow allows you to access your project and save a version of it.

Mylenium

[nishu_kush]

I'll move your post to the Discussions board while we await your information.

Thanks,

Nishu