I created a normal user along with my admin user to test upvotes, in my localhost.
When I upvote I get an error and when I try to post a question too. What might be wrong?
Okay I found those posts
http://question2answer.org/qa/4826/error-1452-cannot-add-update-child-foreign-constraint-fails?show=4826#q4826
http://question2answer.org/qa/1727/cannot-ask-question-foreign-key-error
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