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Flow Issue

ah, these are tricky - there's a config error somewhere in the Flow that is not displaying on Save. Hopefully you have a previous version. I'd start with the previous version and selectively add back in each new element, saving as you go

https://salesforce.stackexchange.com/questions/391433/error-when-trying-to-save-a-flow-something-went-wrong-hmm-that-didnt-work

https://developer.salesforce.com/forums/?id=9062I000000XoSOQA0

For me, there were some "old" conditions" not necessary, I "cleaned" up the flow... deleting unnecessary conditions... problem solved... the error description does not help much...

Error Running a Flow in the Sandbox

I found out that this error was due to the test records I was using. I'm uncertain about what was missing from those records. However, the problem was resolved by creating new test records.

このエラーは、使用していたテストレコードが原因であることがわかりました。それらの記録に何が欠けていたのかはわかりません。ただし、この問題は、新しいテストレコードを作成することで解決されました。