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Django error when creating the database file

Time：11-14

(python3.7.4) C: \ work \ myDjango \ test2 & gt; Python manage. Py makemigrations
SystemCheckError: System check identified some issues:

ERRORS:
Booktest. BookInfo. Bcomment: (fields. E120) CharFields must define a 'max_length'
Attribute.
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