Getting rid off error message at beginning of mission

[JS_F 0]

Hey, can anyone help me to get rid off error message at beginning of mission (I have only played official missions and the error message happened in ever mission)? The error message made the cutscene at the beginning of the mission not played. I have used wgl5 mod with some self-made replacement (only for self-use). I think it's the problem with my self-made replacement pack and the problem doesn't actually affect gameplay, but no cutscene is really annoying.