The error is:
Error 1100: FATAL - DEM particle input file not found!
There are two ways to insert particles into the system - you can use automatic particle generation, OR use a particle_input.dat file.
If you enable automatic particle generation, then the particle count in the initial conditions pane will be used. If you don’t turn on automatic particle generation, then you need to specify a particle_input.dat file, and for SQP particles you will need to use the version 3 format, which is not well documented but you can read about it in this post
I’d suggest you use automatic particle generation, as it is simpler and easier and doesn’t require you to create the file.