Music streaming app in Google Actions error

I’ve built a very simple streaming app that plays multiple MP3 that the user can skip and play the previous songs with their voice commands.

It works fine with Alexa but Google Actions crashes as soon as it starts playing the first track. Here is the only error I can find:

‚ÄúsharedDebugInfoList‚ÄĚ: [
‚Äúname‚ÄĚ: ‚ÄúResponseValidation‚ÄĚ,
‚ÄúdebugInfo‚ÄĚ: ‚Äú‚ÄĚ,
‚ÄúsubDebugEntryList‚ÄĚ: [
‚Äúname‚ÄĚ: ‚ÄúUnnecessaryField‚ÄĚ,
‚ÄúdebugInfo‚ÄĚ: ‚Äúfinal_response.rich_response: ‚Äėsuggestions‚Äô will be ignored since they are used in ‚Äėfinal_response‚Äô.‚ÄĚ,
‚ÄúsubDebugEntryList‚ÄĚ: []

Anyone can help with solving this?

Thank you so much!