Fatal error: Incompatible file format

Issue: when you visit website, it shows similar error: "Fatal error: Incompatible file format: The encoded file has format major ID 4, whereas the Loader expects 5".

This error indicates that your script became obsolete and php 5.4.x server (and php 5.3.x) doesn't support old Zend encoder. You need to reinstall script using Zend Guard. Please contact script vendor for assistance with upgrade.

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