Unnecessary Characters during installation

Upon plugin activation I received this notice:
The plugin generated 935 characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.

I disabled and then re-enabled and received this notice:
The plugin generated 1165 characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.

The amount of characters grows.

Also..
Within the WP Plugins Admin, upon launching “more details”, the link within the plugin for “Plugin Homepage” goes to test.com
Might want to fix that.