@Ofi Khan, I have just taken a brand new, full backup using akeeba just now, I downloaded it via ftp and ran the akeeba installer.
No errors durong restore, when I click to visit my site's front end I see the exact same error.
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Failed opening required 'C:\xampp\htdocs\stc\components\com_sppagebuilder\parser./../helpers/helper.php' (include_path='C:\xampp\php\PEAR')
I can access the /admin area but the page design is broken, see https://imgur.com/J3Ds9mN
Nothing is missing from the backup. Every single file on my live web space is currently on my dev environment.
This error is not caused by missing files, and not Akeeba’s fault. It’s due to a dodgy include path in SP Page Builder Pro v3.