Magento theme "Grand" error "An error has happened during application run. See exception log for details."

Hello,
I have already purchased this theme “Grand” and installed on localhost and live server according to guide document.
But it is not working.
As this theme is perfectly fine on php version 7.1.x
So I removed and installed new xampp 7.1.3. But also not working.
Please help me.

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