Thanks! I have always used 999999. I had special circumstances last year and went to a tax preparer and they even used 999999. This year it would let me.
If the miscellaneous code suggested still does not work, take a look at the Arts, Entertainment, and Recreation codes. Code 713990 for example, is for all other amusement and recreation industries.
Yes, you used an acceptable code. I'm not exactly sure if they changed the codes, but what you used will allow you to proceed to file your Schedule C.