FMOD Result Error 30

Good day,

I’m new FMOD and this is my first time actually using it. At the moment I’ve created a class with functions to play sound and load sounds etc…

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Yet I’m getting thrown a fmod result error 30, an invalid object handle was used.

May I know what’s happening? Thanks!!

Sorry for spam but i can’t seem to post more than 1 screenshot at the same time,

hence below is my function call:
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Error 30 is FMOD_ERR_INVALID_HANDLE, what exactly is returning the error?