Project: caches will not go away, cannot be opened.

Okay, I have 3 project: caches in my inventory. I never opened them because I always thought the whole project thing was idiotic, literally couldn't have possibly had less interest in them if they were a pile of rocks. However, they have been getting on my nerves as of late and I want them gone. They cannot be opened... it errors out saying the server is not responding and may be offline and links to the is legends up page... Can I get them removed or something?