I ran the application then tried using command + v to test it.
It worked for me. Pasted it into TextEdit and into Terminal.
Try opening a new window in AppleScript Editor.
Enter this script:
Click Run.
Post the result.
If there's no result, say "There's no result".
Select the entire text of the script.
Choose Copy from Edit menu.
Click Run.
Does the Result show "get the clipboard"?
Also, you need to explain exactly what "I ran the application" means.
I'm not "running an application" when I do these tests. I'm simply using AppleScript Editor, and telling it to Run a script I've typed in. It's not an application yet. It's just a piece of script.
If you're using AppleScript Editor, you need to identify that. If you're using something else, identify that. "I ran the application" is too vague. Be specific.