If you copy/paste text from another document, especially where a different editor was used you may encounter an error like this
If, when you check that the braces around any tokens or tables used are correct, then the problem may be the formatting around the text you copied.
Highlight the text and click the 'Clear Formatting' icon 
and try to save again.
If you want to investigate more deeply, you can click the Code View icon 
to see the underlying code and formatting.