Message Oracle ORA-29959 - error in the execution of the string routine for one or more of the index partitions

ERRORerror in the execution of the string routine for one or more of the index partitions
CAUSEAn error occurred during execution of the routine for one or more of the index partitions
ACTIONCheck the *_IND_PARTITIONS view to see which partitions are marked FAILED. Rebuild or Truncate the FAILED index partitions