From another website:
"If you get an error message that says you must call in, and report Error Code 101, don't panic! All that means is that there are too many other businesses with similar names in the IRS's system for it to be processed without human intervention. I recently had this happen and when I called in to do the application over the phone, I found that there were some 27,000 other businesses beginning with the same first word as my client's business! "
The IRS assigns a name control to your business and normally uses the first 4 letters of the first word in your business name.