AS
SEVERE: The free space of the simulation server is not enough. Increase free space to avoid this in the future.
How do I solve this problem?
If this is the case you are referring to:
http://www.ariscommunity.com/users/andersonsilva/2017-03-06-aris-7-0
you need to increase amount of RAM for the Simulation server. Which version of ARIS 7.x are you running?