COMSOL 4.3 with MATLAB error 2

I have the code that have for loop.
Before the first loop is finished, we met several error messages




??? Error using ==> mphinterp at 317
mphinterp (292): Java exception occurred:
Exception:
java.lang.RuntimeException: Error in reInitializeModel
(rethrown as com.comsol.util.exceptions.FlException)
Messages:
Error in reInitializeModel






??? Error using ==> mphinterp at 317
mphinterp (292): Java exception occurred:
Exception:
java.lang.NullPointerException
(rethrown as com.comsol.util.exceptions.FlException)
Messages:





??? Error using ==> mphinterp at 317
mphinterp (292): Java exception occurred:
Exception:
org.eclipse.emf.cdo.common.util.TransportException: java.util.concurrent.TimeoutException
(rethrown as com.comsol.util.exceptions.FlException)
Messages:
java.util.concurrent.TimeoutException



Is it a memory problem?
We have a 16GB RAM.
I increased the java memory to 7GB.
But, I have that problem continually.
May I get the solution?

Kyungnam Kang