Adding GO at the end of my procedure creation script causes an error. Why?

I am scripting procedures together so I can have one script that creates a series of procedures. i've come across 1 procedure that I've broken down as listed below and I get an error message when I add go at the end. I need to GO so I can go to my next procedure I will becreating in the script.
CREATE PROCEDURE [dbo].[TestProc] (@Param1 INT, @Param2 INT OUTPUT)
AS
BEGIN
print 'HELLO'
END
GO
Error message is :
Msg 102, Level 15, State 1, Procedure TestProc, Line 5
Incorrect syntax near 'GO'.

Nothing wrong with that CREATE script by itself, it should complete without error. The problem may well be in the next item of your script.

thats the problem... there isn't anything after the go.. strange isn't it?

I don't think the actual body of your procedure is just ...
print 'HELLO'
If there's any syntax problem in the actual body of the procedure, then GO will be the first thing that SQL Server can make sense of again.

I had simplified the proc to the point of all it's doing is printing 'hello'...i disconnected from the database and re-connected now it compiles fine..
i just wanted to know why I was getting the error message. if you don't have an answer; cool. i'm the type that wants to know what was happening so I can avoid it in the future.

Sometimes , when you copy and past from external unicode text editor or html page , there is hidden control chars (char with asci code 0-31) are inside the code and are not visible, and lead to a compilation error.