Problem solved. I was returning the wrong type in a method within the context of my code's logic.
computerdude
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First of all thank you all for downvoting me, it really improves the chances of me leaving an answer.
In my case it was a Flutter custom plugin issue, the problem was solved by changing:
func speak(_ text: String) {
textToSpeech.speak(text)
}
by
func speak(_ text: String, result: @escaping FlutterResult) {
textToSpeech.speak(text, result: result)
}