LabVIEW: The VI is not in a state compatible with this operation

Hi Experts,
I tried to save a developed file of VI on Block diagram of Lab VIEW FPGA VI. But it threw an error message and finally it was saved.

Error
Not enough memory to complete this operation.
OK
I tried to accumulate the program to start with FPGA board. The same error mentioned above occurred. Three times I had to click ok for stopping the compilation and then occurred code generation error as under:
“Error 100 occurred at an unidentified location”
“LabVIEW: The VI is not in a state compatible with this operation. ”
Do you have any idea regarding these problems?
My PC configuration is Intel Core2Duo 3.16GHz, over 100 GB free hard Disk space and 3.25 GB of RAM.
Please help me.
