I am getting this ‘length_is’ error, and I don’t understand why it appears when I click on the ‘Add Category’ button.
Welcome @nimeshmeh7a !
When requesting assistance with an error, please post the full error message and traceback from your server console. Try to avoid posting screenshots of errors. The information from the traceback tends to be more useful.
Also, for this specific issue, see the entire thread at TemplateSyntaxError at /admin/userauths/profile/add/