Issue with custom monsters!

[Shabbasaur]

Long story short, I have spent the last 2 hours trying to get my custom monster to work. Whenever a battle with said monster is triggered ingame, or it is battle tested, the screen pops up with: An invalid enemy character was specified. 

The graphic for the monster is formatted correctly for rpg maker and I can edit it in the database fine.

Does anyone know how to solve this issue?

 

[Sakuri]

i might be able to answer your question but i need a screenshot, there are many reasons why it might not work, try examining the default monsters and compare it to yours