"Omeka encountered an error while upgrading your installation:"

"Migration file '018_schemascrub.php' does not follow proper naming conventions."

I restored from my database backup, but with no effect. Any suggestions?

Fixed! I'd copied over the updated migrations folder without regard for those extra elements.

I got the same error-
Migration file '018_schemascrub.php' does not follow proper naming conventions.

What exactly did you do to correct this? Thanks!

Figured it out-- I had to delete the old files from
application/migrations then it worked fine.

Had same problem. Blowing out existing /application/migrations content and putting all new 1.3.x code in the directory fixed the problem.

Documentation should mention this.