.op2 file is generated even if analysis has crashed. Check your analysis has actually succesfully completed
Are you still unable to see the results? or those warning a different issue?
Try clearing the T(*) values from MATT1 as the warning suggest and see if this helps in any ways.
Feel free to share the *.dat file if you want someone to look into this for you.
- Do you check if it is statically determinated? Check if there are rigid modes using a SOL103.
- A static linear solution give resonable results?
- What happen if you apply only 10% of the load on your non-linear simulation? Does the simulation run properly and give you correct results?