Well this is just a notice. You got the two options.
- Ignore the error and Turn off the developer mode
- Debug the code and fix it
To fix it goto
on line 18 and there will be a variable named $html . You will have to go through the code to check the usage of this variable. you may use
isset() to remove this notice but make sure to check that it is not affecting the existing functionality of the site.
Or simply initialize the variable