After Event created I can get Master Bus but not each Buses.
How can I get it?
Thanks in advance.

FMOD::Studio::Bus* pp[100] = {};

//pStudcioSystem->getbus("bus:/", pp);
FMOD_RESULT result = pStudioSystem->getBus(TCHAR_TO_UTF8(*FName("bus:/").ToString()), &pp[0]);
result = pStudioSystem->getBus(TCHAR_TO_UTF8(*FName("bus:/Kick").ToString()), &pp[1]);
result = pStudioSystem->getBus(TCHAR_TO_UTF8(*FName("bus:/Perc").ToString()), &pp[2]);

This error indicates that the path you passed in does not exist in that System object.
If you are confident these paths are correct, it’s possible you are using a different System object to the one you think you are.
My guess would be that you are creating a new system object instead of getting the existing one from IFMODStudioModule. If you have something to the effect of:

FMOD::Studio::System* pStudioSystem;
pStudioSystem->initialize(32, FMOD_STUDIO_INIT_NORMAL, FMOD_INIT_NORMAL, nullptr);

Replace it with:

FMOD::Studio::System* system = 

And see if that fixes it. Otherwise you might be missing a Master.strings.bank as per the docs, quick way to check would be to rebuild FMOD banks and make sure “Load All Banks” is enabled in the settings.

Thanks I fotgot to create Bus at Fmod Studio.