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What is a 400 Bad Request invalid request mean and how can I fix it?

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appears when answering request on facebook for cityville app

appears when answering request on facebook for cityville app

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That issue can be caused by corrupted cookies.

Clear the cache and the cookies from sites that cause problems.

"Clear the Cache":

  • Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"

"Remove Cookies" from sites causing problems:

  • Tools > Options > Privacy > Cookies: "Show Cookies"