[eluser]Phil Sturgeon[/eluser]
There is something being output in your helper. This could be an error that is not being caught properly or it could be some whitespace outside of the <?php ?> tags. Remove all whitespace and if you still get the problem then paste up the lines around line 40 so we can see whats wrong.
When you want errors fixed here, the message is not as helpful as it would be with the actual code.
