I opened your model and it appeared to have a lot of errors. It seems to either not have all the files are be malformed in its current state. This is what I see when I open it:
That being said, I went into the definition of your study named "Bulkhead" and noticed that while there are many loads and man connectors there are no fixtures to hold the model in place. Is your intention to have the loads balance themselves? If so, you would want to go into the study properties (right click the study name at the top of the boundary tree and go to 'Properties') and turn on "Use inertial relief". This would stabilize a system of balanced loads on a model and help the solver to run.