I created a new warlock and found the spell Omen.  It does not provide the source material that it is in, though it does say Version 1.  What does that mean?  Is it a home brew spell?  Please help!

There is no official spell called omen, so it must be a homebrew. 

Any spell or magic item that displays a “Version” field (even if no version is displayed) is automatically homebrew. Official stuff never displays a Version field and instead displays source information.