Hello to all of you

I am trying to make a simulation and i get an interferences problem. The simulation is between a fitting and a plastic pipe.

The fitting is fixed and i apply a charge to the extrimity of the pipe. The purpose is to check the stress apply to the fitting in real field condition.

Here's the picture of the model.

And this is the picture of the interference. Is there a way to ignore this to make the simulation? I tried to check "allow penetration" but the error always show up when i try the simulation. I join the setup file with my post if someone is interested to help me. Thank you very much!