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I upgraded to Vanilla Forums to 2.5.1 and saw the prompt in the admin section to upgrade to php 7.
However after upgrading to 7.1 i find that certain admin pages result in 503 errors, for eg: /dashboard/import
This error occurs with php 7.0, 7.1 and the forum is completely non functional when using php version 7.2.
I had originally installed with Installatron some time ago and read that package managers can unintentionally break things so i manually downloaded vanilla 2.5.1 and overwrote my existing forum files, but the problem continues.
I read elsewhere in your support forums that these issues are due to changes in php 7:
How do i fix this issue and also why am i prompted by my vanilla forums installation to upgrade to a version of php which breaks some of its functionality?