Upgrading from 4.1.4 to 4.2.1/ Not Locating Plugins

[tkat]

I've made several attempts to upgrade from ver 4.1.4 to 4.2.1.  This entailed updating PHP to 7.2 as well as uploading a new SourceGuardian file.

On Step 4. Configuration I keep getting the error message "One or more plugin files couldn't be located. Check install.log file for more information.

The log file says:

Starting file-check for plugins...
Plugin: openXAdvancedMobileTargeting - Unable to locate XML files
Plugin: openXBannerTypes - Unable to locate XML files
Plugin: openXDeliveryLimitations - Unable to locate XML files
Plugin: openX3rdPartyServers - Unable to locate XML files
Plugin: openXReports - Unable to locate XML files
Plugin: openXDeliveryCacheStore - Unable to locate XML files
Plugin: openXMaxMindGeoIP - Unable to locate XML files
Plugin: openXInvocationTags - Unable to locate XML files
Plugin: openXDeliveryLog - Unable to locate XML files
Plugin: openXVideoAds - Unable to locate XML files
Plugin: apLoader - Unable to locate XML files
Plugin: apVideo - Unable to locate XML files
Plugin: TrackingPlugin - Unable to locate XML files
Finished file-check for plugins

...

I've verified that all these XML files exist in the current install.  

Would really appreciate any insights into this issue.

Thank you.

[andrewatfornax]

Duplicate post of https://forum.revive-adserver.com/topic/5384-upgrading-from-414-to-421/