Error when create trunnion for elbow MDS

Dear expert

when i try create a trunnion for elbow MDS . It show error:

(42,501) Question HSTU ( Answer NONE ) cannot be answered
In line 383 of PML function mdssetdattt14
sel hstu
Called from line 1 of Command/Form Callback Command
call !!Mdssetdattt14(!!Mdstt14,'CREATE','ELBO')

How to fix this error