amorphous cell job fail

Hi,

I've created a polymer chain which contains about 10000 atoms.  But my efforts to create an amorphous cell have failed so far, no matter how I try.  I only used three polymer chains. Still it couldn't create one.

Another example, I wanted to solvate this polymer in an organic solvent. I add one polymer and 5000 organic solvent molecules to the amorphous cell. I didn't work either.

I wonder why I'm experiencing so much difficulty in creating a amorphous cell. Any suggestions?

Thank you,