When I try to create a new branch called “20211211_DataPanel” I get the (probably correct) message
'20211211 DataPanel' is not a valid branch name. Valid branch names include only letters, numbers, underscores and hyphens.
I would be nice if the IDE would let me correct my mistake. Currently it just closes the dialog.
When I try “20211211_DataPanel” I get:
JSON Parse error: Unexpected identifier "An"
It’s been reported before a few times:
I suggest you read those forum topics (and always searching for a similar problem before creating a new one).
By me 
I remembered having encountered something similar. I would have expected such a probably simple error to be fixed by now.
Well… Then you certainly don’t need to report the same error again! hehehehe 
It’s probably simple, but I could not be as simple as it looks. Also, since this is an error that only affects the developer, not their code or their users and it’s easily avoided (changing the name of the branch) they will probably leave this error with way less priority then other more important bugs or features. I know I would.
But don’t worry, the Anvil Staff will eventually fix this. 
.