SQL Agent ODBC Message: 0, String data, right truncation [SQLSTATE 01004]

Hi,

I'm getting the above error message in the agent log, followed immediately by

[298] SQLServer Error: 2601, Cannot insert duplicate key row in object 'dbo.sysjobactivity' with unique index 'clust'. The duplicate key value is (8010, ff1bf0f1-7834-422b-be4c-b90720ac4e54). [SQLSTATE 23000] 

then

[298] SQLServer Error: 3621, The statement has been terminated. [SQLSTATE 01000]

This is on SQL 2012 SP1 CU3 Enterprise and it is a target server for MSX.

Any help or direction would be greatly appreciated.

Thanks

Dale