Please help

[minicreeper01]

So , I am fairly new to tekkit lite, and was trying out all the mods on it. I was messing around with Mystcraft, and warped to an empty age. I couldn't get out, so I just did /kill. I was then spawned in a random place, so I closed the game. When I tried going back into tekkit lite from the launcher, it wouldn't work, so I tried resetting the modpack. When I pressed play however, I kept on getting the error message,

 

"error installing tekkit lite.

an error occured when attempting to delete (blah blah blah) from the cache.

Please check your system settings."

 

How can I fix this?