If you have had a play with the awesome Code generation tool that you can build yourself:
Walkthrough: Generating Code by using Text Templates
Then you might have had a small issue with the above error:
A template containing a class feature must end with a class feature
The error is caused by an invisible space after the last #>
It is also important to bear in mind, that invisible spaces may cause other hard-to-understand compile-errors.
If you want to see a bigger picture, just look at following links:
Now that you are aware how harmfull invisible spaces can be when dealing with Text Templates, my advice is: Make them visible. If you don’t know how to do it, see Jeef Widmer’s blog