The project is done on Windows and now need to be built for iOS so I git clone it on a Mac and get this error. I know the backslash is wrong but how can I fix it.
Thanks for letting us know about this. It looks like it is due to a bug where the source bank path was cached on Windows, so it includes a Windows path separator.
We’ll look into fixing the bug, but for now you should be able to resolve the issue by opening the FMOD settings and browsing to your FMOD Studio project location again, thus causing the source bank path to be re-cached. If this does not resolve the issue, can you post a screenshot of your FMOD settings? That may shed more light on the problem.