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Dear STKO team:
I tried to simulate a tower with Angle steel. i think the Angle steel is truss element. But no matter how I adjust it, it can't run normally, and there is a screenshot. What should I do next?The file is uploaded to the attachment.
I according the BASIC TEUSS EXAMPLE'S analysis comamands ,if there has any mistakes? See screenshot for details By the way, can you help me check whether there is any problem ?

the Best wishes.

The error is saying that your model is singular.
If you use beams instead of trusses it runs fine. It means that using trusses creates some rigid body motion/rotation.
Make sure the model is correct and you are not missing any truss.