OpenSP: Unterminated comment: found end of entity inside comment
Check that you are using a proper syntax for you comments, e.g: <!-- comment here -->. This error may appear if you forget the last "--" to close one comment, therefore including the rest of the content in your comment.
|<!-- comment here >|
|<!-- comment here -->|
Fix the broken comment.
- W3 validator: http://validator.w3.org/