Shoutbox

I'm trying to make a script with an input window, but MsgPlus.CreateWnd keeps failing even though the XML file has good syntax and matches the schema...

I've included my files. If anyone could check to see if there's something missing or maybe give some tips what I could check for?

Thanks in advance.

PS: there isn't any code for the functionality yet, thought I'd get trhe window working first since its the first time I tried using one.