Hi @Sagar Nagavekar @Aliya Munir @Hatice NALBANTOGLU @mariem yahmadi,

I was receiving the same error, then I tried it in a different org and succeeded. I'm not sure if the record type is the main problem, but I've noticed that although there are two record types for opportunities in my old org, there are none in the new one. If it is helpful for you then mark it as the Best Answer.

@Salesforce Trailhead

Thanks!