When you have done that, check you have the following files (for each of your original .ttf files):
NB The .afm files have been deleted (but .t1a and .ufm should remain).
The next step will generate the additional files for embedded subsets
Execute Step 7 (NB This may take several minutes for large font files; you may need to increase the time-limit or memory-limits - see the top of the /makefont/makefonts.php file)