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Class url generate 404 error

My permalink setting is: /weblog/%12 months%/%monthnum%/%postname%/
all the things is working advantageous besides the class URL.

for instance, my web site generate class URL like –

www.instance.com/weblog/article/

And I am unable to go to this web page acquired 404 not discovered

article is a class
however my different web site generate like
www.instance.com/weblog/class/article/

Easy methods to repair this concern. I am new to WordPress.