Error message when running a SQL maintenance plan backup

I'm receiving the following error message when my daily maintenance backup plans execute: Error Message 1: > SQLServer Error: 407, Internal error. The string routine in file e:\sql11_main_t\sql\ntdbms\storeng\dmu\dbcc\source\dumplog.cpp, line 5473 failed with HRESULT 0x8007007a. [SQLSTATE 42000] (ConnExecuteCachableOp) Error Message 2: > SQLServer Error: 8630, Internal Query Processor Error: The query processor encountered an unexpected error during execution (HRESULT = 0x80040e19). [SQLSTATE 42000] (ConnExecuteCachableOp) What can I do to fix these errors and get my backups to run successfully again? Thank you in advance.