Are you compiling for the SMALL model? From the error message, that appears to be the case and you have a 100-byte data object allocated to the default "data" space. If you are using an 8052 derivative, you can try allocating the data object to "idata" space. If you have external RAM, allocate it to "xdata" space while still using the SMALL model, or just use the LARGE model Target option.