The issue was that you were trying to add a load case to a generation that was not defined ahead of the generation. I moved the load case 146 ahead of the load generation and renumbered it to load case 1. The load generation now works fine with the load…

- Yes, You're right. Can I described this factor on Response Spectrum defination as shown ? - And anyhow,as ASCE 7/10; I'll compare that Response Spectrum > 0,85*Equivalent Earthquake Load...

You should use the ADD LOAD option as explained below for combining other existing load cases with generated moving load cases. If you need to add multiple such cases to the generation, you have to ensure that you define REPEAT LOADs ( and not LOAD COMBINATION…