Unrelated to the issue with Animation Editor, but the GSI error that Jobel shows comes from GoogleSignIn, it seems you (the editor or your servers) have some issue with credentials or loading of data which you also need to look into DiegoM.
Also all the "inline" errors with the CSS should be fixed, very irritating when the console is full of errors/warnings just with a regular loading.
You can see the error messages above from Jobel, I get the same.