Konami has posted on their site that they are aware of the Master League Crash.
“We have confirmed that several users are currently experiencing an issue that causes the game to crash when starting up a new game in Master League.
We are still in the process of investigating this issue, and to that end, we would like to ask for your assistance.
If you are experiencing this issue, we ask that you submit an inquiry to us from [Online Support] > [FAQ & Inquiry] on the official eFootball PES 2021 website.
From there, select your game edition, scroll down to 'Is the problem solved' and answer 'No' - this will open the form. Please fill out all relevant fields, and press 'Send' when you are done.”
If your having these issues, follow those steps to help report.
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