Out of memory

You don't have enough free memory for Turbo Assembler to assemble your
file. 

If you have any TSR (RAM-resident) programs installed, you can try
removing them from memory and try assembling your file again. You may have
to reboot your system in order for memory to be properly freed.

Another solution is to split the source file into two or more source
files, or rewrite portions of it so that it requires less memory to
assemble. You can also use shorter symbol names, reduce the number of
comments in macros, and reduce the number of forward references in your
program.