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The APS Catalog has been deprecated and removed from all Plesk Obsidian versions. Applications already installed from the APS Catalog will continue working. However, Plesk will no longer provide support for APS applications.
Please be aware: with the Plesk Obsidian 18.0.78 release, the support for the ngx_pagespeed.so module will be deprecated and removed from the sw-nginx package.
I've got nearly the same error, but was not able to upgrade the server 14.04 => 16.04 at the moment. Therefore I had to investigate a little bit. Now I want to tell the solution that works for me. Perhaps it may be helpful for someone other.
Short version:
Cause of the error is a mismatch...