upgrade plesk 5.6 at least
Current plesk php version is 5.4 please upgrade it to 5.6 if possible php 7.0
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You can switch PHP versions (from 5.1.x to 7.0.x) and handlers (CGI, FastCGI, FPM and Apache module for version by OS vendor) in Plesk since version 12.0. But we do not plan to implement this feature in previous releases.
—ES