Hi,
This is the second case we receive this week about this issue.
It's very strange, because most of users are using FP8 without problems.
This error is triggered when 3DS Max causes an exception in the assets loading process. This process involves several steps: merge assets from file, assign materials, etc.
We suspect something very specific (a third party plugin, a script ?) must be interfiring with Forest. But until now we could not identify what.
Please, try this:
1. Be sure Max is closed.
2. Make a copy or rename the Max 2022 configuration folder: C:\Users\<user name>\AppData\Local\Autodesk\3dsmax\2022 - 64bit
3. Launch Max. It will create a new profile, clearing part of your configuracion and scripts.
4. Use Forest and check if there is some difference.
You can restore your profile at any time, with the copy or restoring the folder.