Slender Member, Design Skip Issue for Angle Bar

Hi,

I just want to ask if angle bars not design because its a slender member is an issue? or maybe I have error in my input?

I check on other forum about assigning Main /Tmain to skip the slenderness check but still I got the same error.

Any help would be appreciated on how to fix this problem.

Thank you in Advance.

Please see attachment.

SU_1a.std