Beam Joints in a Truss Model and Galapagos Simulation

Hello i am new here and need help for my Bachelor Thesis.

i modeled a truss and trying to connect every beam with a joint. But it doesnt work.

Secondly, i want to do an Normal Forces Optimization with Galapagos. But i cant go further.

Thank you for your help i appreciate it very much.

The file is attached.