The line you indicate in the error message does not exist in the source code you posted. The closest there is to it in your source is
decm_eq=bin2dec([I_runcode(a,b).code(1+m*(c_indx-1):m*c_indx),dec2bin(0,bpp_diff)]);
In order to have a realistic chance of figuring out what the error is, you need to post the actual error message, which might (for example) look like
Attempt to access structure field of non-structure element
or perhaps
index out of range
or perhaps
undefined function or variable dec2bin
