IK and constrain

hi i am actually a noob in 3d..maya....i was trying to rig a realistic human character and when i try giving IK to the arms.... its fine...but when i try to constrain the wrist with a shape ..it gives me this error "/ Warning: Cycle on 'Skel_Le_wrist.parentInverseMatrix[0]' may not evaluate as expected. (Use 'cycleCheck -e off' to disable this warning.).... tried many times... its the same...help pl