Fix the error :
Script "/usr/local/share/ntopng/scripts/lua/index.lua" returned an error:
/usr/local/share/ntopng/scripts/lua/index.lua:5: attempt to call field 'isPro' (a nil value)
- Download this file: ntopng-x64-debian7-1.1.tar.gz
- Click on the TOP arrow and choose Update icon.
- Select Softwares tab and click on Manual Update button
- Upload the ntopng-x64-debian7-1.1.tar.gz file.
- Refresh the page that display the error.