Error using Cbush

Hi all,

i get this error when runing static analysis in optistruct : 

  *** ERROR #   99 ***
  CBUSH           element     166866 references incompatible PBUSH.
  K2/M2/B2, K3/M3/B3, K5/M5/B5, and K6/M6/B6 on PBUSH must be zero for
  CBUSH with no G0, CID, and blank X1, X2, and X3.

Can somebody please help me !

GAYE