Steps to reproduce:
1. Create Project in Ae Beta
2. Save Project
3. Open Project in Ae 21 or 22
Result: Project wont open error and 33 : 5
(In my original project I get the above error in addition to 26 : 00) (screenshots attached)
Expected: It should open without issue
Application: After Effects (Beta) v184.108.40.206
OS: macOS v12.3.1, RAM: 32.00 GB GB, CPUs (logical): 8
This was happening on my other computer (PC), and for my client as well. I think this is a recent issue and I have previously been able to open projects in previous versions of Ae when using Beta, if I recall correctly.
I have tried every method of exporting and importing that I can think of, and I haven't got anything to work. I originally thought that it was a problem with some footage I was using, but it is now happening for me with a fresh project (new project with an empty comp, attached).
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Project incompatibility was an issue with a couple of beta releases. Upgrade to a newer version of the beta (22.4x35 or later), re-save your project and it will become compatible again.