Nativization Error: Redefinition of FOnFloatValueChangedEvent Synthesis Plugin's SynthKnob.h

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Hi everyone.
I am getting nativization error while packaging for android.

C:/Program Files/Epic Games/UE_4.25/Engine/Source../Plugins/Runtime/Synthesis/Source/Synthesis/Public/UI/SynthKnob.h(23,45): error: redefinition of ‘FOnFloatValueChangedEvent’

I used 6 different Knobs in my widget bp. And I used OnValueChanged Event for each knob.
I checked that I didn’t use same OnValueChanged event for any of knobs. I can’t call more than one time though. But somehow nativization tells me that I redefined OnValueChanged Event.

Thanks for help,
Best Regards.