If you copy and paste any links in like this {{http://www.URL.com}} then you will get this error message:
![Content is invalid, merge tag or block tag contains error message](https://mailbluster.com/wp-content/uploads/2023/12/invalid-content.png)
The correct way to set the merge tag is this: {{tag_name}}
You can try this method if you want to include links in your campaign without the merge tags:
![Include links in your campaign like this without the merge tags](https://mailbluster.com/wp-content/uploads/2023/12/Correct-Way.png)
Please Note: Using the wrong merge tag will trigger this error: “Content is invalid, merge tag or block tag contains error.“