Hello Oscar,
Well, the message says clearly where the problem could be. You acceptance criteria are somehow too strict.
What you can do is to remove the criteria. Run the generator. Do you see strategies? If yes, add acceptance criteria starting from the number of trades. Start with 100. Run the generator again. Go with 200 and run it again…this way you will see where is your limit.
Do the same thing for your other selections in the acceptance criteria. And when you do that remove the Monte Carlo, Multi-Market or whatever you use. Just to make sure you are getting into it step by step.
Now, it could be the case that you have very small Historical data. How many bars you have on M15 or H1?