Form won't distribute. Here's the error and everything I've tried so far. Hope you can help

Question

I've seen at least 2 similar posts on the web, but they ended with no answer. After creating my form with LiveCycle Designer, saving as pdf, and hitting "DISTRIBUTE", I get this error:
"The filename you specified is not valid because it does not include a .pdf extension, contains one or more invalid characters, or the path preceding it refers to a protected system location."
So I've done all of the following, many of which were recommended in the other 2 posts, but similarly, have reached a dead-end. Distribute still doesn't work, so I can't use my form:
I tried checking and unchecking the "hide extensions for known file types".
I tried resaving the pdf with a simple one word name, no special characters, a word like hello.
I tried moving the pdf and saving to C:\   root.
There are no errors on the form.
Why am I getting this error? I put a lot of work into the form, so am eager to start using it, but I can't really use it properly until I get past this Distribute step. I don't mind posting the form so someone can take a look at it and please help me. Thanks.

Answer 1

FOR ANYONE WHO HAS THE SAME PROBLEM
I FOUND THE "PROBLEM". IT'S SIMPLE:
The file was just too deep within a path (folder inside a folder etc). All you have to do is move/copy the form/pdf to your desktop, then open it and hit Distribute. You will no longer get that error.
Hope that helps.