problems in java( using Gridsim)

hi,
i am doing simulation of my project related to grid computing, when i run the simulation following error occurs

Exception in thread "main" eduni.simjava.Sim_exception: Sim_entity: Entity names can't contain spaces.

at eduni.simjava.Sim_entity.(
Sim_entity.java:154)
at gridsim.GridSimCore.(Unknown Source)
at gridsim.GridSim.(Unknown Source)
at storage.Checkpoint_Broker.(Checkpoint_Broker.java:94)
at storage.Checkpoint_mainclass.main(Checkpoint_mainclass.java:58)"

i read in rajkumar's FAQs that it occurs due to un necessary spaces in the code i have deleted all spaces but the problem persists, can anyone suggest me the way to remove such errors.

regards


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