Start going through this quite large thread and use forum search. Issues starting OFS has been discussed many times and the solution is probably already there. If the suggestions doesn’t solve your issue then get back with a list of what you’ve tried.
https://discuss.eroscripts.com/t/openfunscripter-a-scripting-tool-3-2-0-release/87447/247
Issues with MPV-2 is one issue people have encountered (but there are others as well):
https://discuss.eroscripts.com/t/openfunscripter-a-scripting-tool-3-2-0-release/87447/139