DEM collision error
 

This is the first time I am working with DEM particle-particle and after I activated it, I get this error and a popup saying "Out of memory"

Error in Fluent dialog box
"""DEM: Memory allocation for collision mesh failed.
Collision mesh width is very small which will give rise to a
huge collision mesh. Consider inspecting your injection setup.
Maybe the number in parcel is not what you want.
Error: Out of memory""""

Can anyone help me with this??

Thank in advance