Symptoms
- 
Several Plesk panel screens show a blank page, with no errors logged to the system 
- 
Errors like these appear in the browser's dev console Error: Minified React error #130; visit https://reactjs.org/docs/error-decoder.html?invariant=130&args[]=undefined&args[]= for the full message or use the non-minified dev environment for full errors and additional helpful warnings. RequireComponent.js:79 Uncaught (in promise) Error: Minified React error #130; visit https://reactjs.org/docs/error-decoder.html?invariant=130&args[]=undefined&args[]= for the full message or use the non-minified dev environment for full errors and additional helpful warnings. react-dom.production.min.js:196 TypeError: Cannot read property 'observe' of undefined TypeError: Cannot read property 'map' of undefined 
Cause
The plesk-ui-library package is installed from the wrong repository, or was not updated correctly.
Resolution
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Connect to the server via SSH 
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Check that the package and source version match the current Plesk version # rpm -qi $(rpm -qa | grep plesk-ui-library) | grep "Name|Version|Release|Source" 
 Name : plesk-ui-library
 Version : 18.0
 Release : 2.centos.7+p18.0.34.2+t210325.1052
 Source RPM : plesk-ui-library-18.0-2.centos.7+p18.0.34.2+t210325.1052.src.rpm
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Reinstall the package to get the correct version: Note: Replace the version number in the following link with the same one as in Plesk # rpm -Uvh --force --nodeps http://autoinstall.plesk.com/PSA_18.0.35/dist-rpm-CentOS-7-x86_64/base/plesk-ui-library-18.0-2.centos.7+p18.0.35.2+t210526.1158.noarch.rpm