Concrete Design RC (BAEL 91)

Hello,

I’m trying to calculate a concrete structure with BAEL 91 and program indicate some fails when I tryi to calculate columns:

First say: Axial force too small. Column design not appropriate. (I think that if the loads are small the program would give a result)

Then I increase the load, and I put more vertical load... and program say:

Due to large slenderness, a detailed analysis of second order is required.

Then I try to calculate a small column and program indicate:

The design Options have excluded all the members in the group.

¿Why STAAD.PRO RC designer, don't calculate this structure with BAEL?

Thank you in advanced