An error comes when i try to open up a Jscript file...

What happened if this error message showed up?.. and how can i fix it?!

I am pretty new to unity and I don’t know much about game engines…But
i like tampering around with stuff and i wonder if i did something wrong…

Monodevelop is glitchy sometimes and you need to re install it. I had a problem with mono before and this fixed it surprisingly.