I did run my config through the JSON validator and it says it's all fine. I think I have found the problem. For some reason on my server (run by a host) whenever I add a plugin and then remove it's files, It breaks it.
I am currently having a lot of trouble with this plugin. I keep getting Error 1114. The plugin worked fine when I first added it, but when I edited the config, and restarted it didn't work and I realized that it was because I made a mistake in the config so I deleted the whole "ArkShop" folder...