C++ Unhandled exception error

[Yohanna]

Just remember you need to glTexImage2d() at least once for each texture, in order to get the memory for TexSubImage to work with!

thanks for remark
I will be aware of that.

At any case, this part of the code is not reached at the moment because of the mentioned problem. the texture that is meant to be displayed with this part can not be reached before the row_index reaches the maximum value of 128:

if (row_index < 128){glutTimerFunc(100, update, 0);}
	else {.the texture displayed with this part..}

I hope this would help to solve the problem but I dont have to try. and any other suggestion would be appreciated

thanks again