ANSYS 15 MEMORY ALLOCATION PROBLEM

Hi Engineers,
I am a final year mechanical engineering student. I'm using ansys-15 to analyse a non linear problem. During the solving process, I encountered an error as followed.
"This model requires more scratch space than available. Ansys has currently allocated 1127 MB and was not able to allocate an additional 2 MB in order to proceed. Please increase the virtual memory in your system and/or increase the work space memory and return ansys. Problem terminated.