Runtime Error when playtesting

Hey guys,

I'm using essentials version 16.2. I stopped working on my project for around a month, and when i came back and tried to playtest it through rpg maker, i got this error message:



Any idea of how to fix this?

thanks guys.

Bumping the thread, since i just realized that the picture i had put up with the image disappeared somehow. (sorry mods, don't know if that's alright)

Any help is really appreciated guys, i've worked a lot on this project and it would suck to lose it all like that.