When I create a new doctype I can't import data on it !?

ERPNext
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1

When I go to form settings in the doctype and try to select on import and when I save give me this error:
For System Manager at level 0 in Countries in row 1: Cannot set import as DocType(Countries) is not importable

2

Go to the Role Permission Manager and then give the import/export rights to that doctype.