It seems that you need an
Are you using 2 spaces for indentation in the YML file? Do you know if SubmittedFormExtension is actually being included in UserDefinedForm's extensions list?
Sorry, I haven't really experienced that. I just got curious. Here, something that might help: https://stackoverflow.com/questions/20964269/1214-the-used-table-type-doesnt-support-fulltext-indexes
Have you tried to google that error? It seems to be related to the FULLTEXT index being only supported in MyISAM Engine or you'll need version 5.6 for support in InnoDB.
Seems to be related to MySQL.
WordPress is crazy popular.
That's some serious OOP and MVC heresy right there. I've worked with some WordPress. It doesn't have to be like that.
But it's fairly smart. It doesn't suggest
text-decoration for example.