Getting error in SACS as *** ERROR - BEAM LENGTH IS .LE. 0.0 AFTER SPECIFIED JOINT THICKNESS OF 0.500 M IS CONSIDERED

Hello,

I am getting error in SACS as *** ERROR - BEAM LENGTH IS .LE. 0.0 AFTER SPECIFIED JOINT THICKNESS OF     0.500 M   IS CONSIDERED.

I have tried for Misc --> Check Model, but it is not working. Can you please guide me?