you probably accidentaly dragged the VPP into itself. or another one in it. Something of that nature... you cant recover the data. Ive' done that a couple times on accident.
Hud messages can only be run if you execute the level alongside a mod... so instead of running the map normally you would have to throw the map into a mod folder then make a seprate vpp for the txt file... or mabye just throw the level in the mod folder and run it. whichever works.
I did run the map with the mod i made but i still didint get the hud messages.I,ll try again and again until it does what i tell too same with cutscenes