FORGE_API_MISSING
What happened
Every file declares the Forge API level it was written for, so an engine that changes later can still read it as it was meant.
What to do
Add FORGE_API = 1 on the first lines of the file.
Example
text
strategy.py, line 1: FORGE_API is missing: put FORGE_API = 1 on the first lines of the file [FORGE_API_MISSING]The wording of the message depends on your file, and the code does not. An error stops the file from loading.