Exception Error? What's an Exception Error and why is FF.Net having them?

[unknown20troper.livejournal.com]

FanFiction.Net Error

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An exception error has occurred while processing your request.

Please email this error message to support@fanfiction.com.

All errors are logged for administrative and security purposes.

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91:99.229.58.42
/login.php

Such errors have been having since yesterday. What's an exception error anyway?