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dear stko team
1、I create a model but can`t analysis. the error is can`t find option atrribute .I can`t find where is the error.
I attached the model.
2、if in beam setion property, I select userdefined .the positons & weights select which one I need to defined before ?
thank you

1、I create a model but can`t analysis. the error is can`t find option atrribute .I can`t find where is the error.
I attached the model.

If you expand the error trace-back, you will see it belongs to the force beam column:
You assigned a fiber section directly to an edge. This is not allowed. You should assign the beam section property instead:
After this you will see that your model will converge to unrealistic results. it's because you are using a too large tolerance in Energy norm. I made it smaller and I used the NormDispIncr, and your model was not converging at all.
Finally the issue is the -GJ in fiber section. You assigned a value that is too small!! (100)

The order of magnitude of the J modulus of your section is 10, and the order of magnitude of G is 4. so you can use -JG = 1.0e14

Now it will work:

DEAR STKO Team,

Thank you for your response.

You're welcome