Why ezdsp f2812 cannot access memory address?

Hi everybody,

I need to use ezdsp f2812 to control a 3 different converters with 3 different controllers. When I implement only two controllers I get a good result and everything is okay, but when I implement the 3 controllers I get this message:

Error: Error 0x00000026/-2140 Error during: Memory, Register, Execution, Cannot access memory address at 0x00000800

All my controllers are implemented in MATLAB/SIMULINK 2010 and interfaced to the dsp using ccs3.3. Could anyone please explain what is the problem and any advice to solve it? Thank you