Please help me with my frame simulation (Model is unstable)

Hi everyone! Can anybody tell me about this frame simulation. I want to do static simulation of this frame. When i started simulation Solid write :"Model is unstable ......."
Then I check on Soft Spring (properties of study) , but it don't work again and solid write "Model is unstable ......."
When I unsuppress gusset and extruded boss - the simulation is work. But i need to do the simulation with gusset and boss.
So please help me with my problem.

1 Answer

Send me this model. I will check.