If you receive below error, check at the specified line. As the error suggest, most probably you have added a line break or some incorrect syntax. To resolve the error just remove the line break or check for proper syntax and the error would go off.
Message: Unterminated string constant
If you are using Linux, check for line break using below command in vi editor. It will show you symbol '$' at the end of each line. Just remove the line break at the specified line.
As the error suggest 'Unterminated string constant', mostly it may occur due to some incorrect syntax.