What does that mean? I can play normally after the editor and the objects work and are fine. I have very few mods and only the ones with the highest rating and most updates. The error message also comes up when I load vanilla buildings in the editor.

Error message because I don't know how to upload the screenshot to Steam:

Traffic Manager mod detected an error while loading saved data.
Please do NOT save this game under the old filename, otherwise your timed traffic lights, custom lane arrows, etc. will get unrecoverable.
Contact TM:PE team via Steam Workshop page or Discord text chat, prepare log files.
[System.Exception]