User Role for Plugin

I have this plugin that I have created for a editor to input text into and it outputs as a widget in the sidebar. The only problem I am having is I can’t seem to get the plugin to show up on the editor and when I get it to show up it outputs a page that says cheatin, uh? Here is the code I have for the plugin/widget

[Code moderated as per the Forum Rules. The maximum number of lines of code that you can post in these forums is ten lines. Please use the pastebin]

I have searched and searched the web and can’t seem to find a solution, but know there are other plugins that allow an option to show up on editor page and the editor to update the plugin.