Cannot create new doctype in version 15


I just installed Frappe and ERPNext version 15 for checking new features. But I cannot create new doctype in my custom app. On save, shows this error in brwser console

What is the issue here, I cannot get it. Can anyone here have any idea?

Frappe team working on it

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The issue on github was:

and it is solved by this pull request:

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