If you notice, the file that is generating the error is part of cobalt, not our module.
It appears to be a bug with the cobalt URL field, there should be a solution to this, I will look into this and get back to you.
In the meantime you should be able to get the modue to work, just don't try to display a URL field in it until we can find out what the fix is.
Please don't try to upload PHP files to our site. I don't understand why you would try to upload one of our own modules to our site, we already have them.