Help with skills in RM2K

[CriticalCrazy]

I've been trying to use RPGMaker 2003 to make a short little project, but for some reason the in-game skills are all disabled. Well, except for the ones that cost 0 MP. It was working fine a while ago, I didn't make any major edits to skills. Just edits on events or the surroundings. I can't find any options that have any relations to skills, and it wasn't an event. It happens in test battle as well. The image I attached is just to show the effects. Does anyone have a possible solution to this dilemma?

 

[Neko Mizu]

Is the player's MP too low?

 

[CriticalCrazy]

Is the player's MP too low?

I have the max MP at 100 for all levels.