Hi, either your mods have been disabled automatically so you need to turn them back on, if they're back on but the save file still gives you an error popup click "skip all", should load fine. If not, try this:
Navigate to C:\Users\%username%\AppData\Local\sins2\settings
Open the settings.json file with notepad or similar app.
And change the following line:
"front_end.enable_strict_saved_game_filtering": true,
To
"front_end.enable_strict_saved_game_filtering": false,
