I try to use GEL function to access actual target DSP board and add
options to Code Composer Studio's GEL menu. I just copy the code from
examples:

menuitem "Application Control"
dialog Loada(loadxParma "Load")
{
        processingLoad = loadxParma;
}
slider Gaina(0, 10 ,1, 1, gainyParma)
{
        gain = gainyParma;
}

Of course, I define two integer variable processingLoad and gain in .c
file. I find that, GEL function work well at most time, However,
sometimes, in several DSP/BIOS application, it doesn't work and give
a error report that is "cannot store to rvalue ". What's the
problem with it? 
Thanks a lot!