Unable to process request at this time -- error 999.
Error 999 on Yahoo! products is an error to say that, well, there is an error! This error code, Error 999, does not stand for any specific error and is more or less a code for any Yahoo! error.
However, this message is generally shown for when Yahoo! limits the bandwidth usage of a person on Yahoo! software for some reason.
This message can be shown when many things are pressed or done through Yahoo! software, as a way to prevent misuse and abuse.
The easiest way to solve this issue is to wait some time and try again later. This should be only a temporary error message, and things should be back to normal after some time.
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