Long story short, something is wrong with your dynamic tags. Two rules need to be applied:

1. Use ‘ but not “

Right version:

$!data.get(‘your_variable’)

Wrong version:

$!data.get("your_variable") 

2. The tag was broken by another tag

Open the HTML editor of the entire message and Ctrl+F $!data.get(‘.

All the tags need to look like this $!data.get(‘something’). BUT! You may see something like this:

$!data.get(‘something' <span><strong>)

And these <span><strong> are what causing the error.