anyone know how to solve it?? I am calculating the column reaction due to wind load, but it show me this after i analysis the model. Both Fx and Fy are 0 KN. i dun know how to solve this thanks.
You haven't defined a mass so the software can't find any natural frequencies. I don't know why you are requesting an eigen frequency analysis, but you might do that occasionally for wind load analysis.
Yeah, I suspect you just didn't properly define your mass source.
If you look in the Manuals folder of your program there should be a "Welcome to ETABS" manual that will have a section that talks at least a little about how to define your mass source.