Normally this error occurs when you upgrade the version of Cpanel.

To resolve this error follow the steps below:

1) Check the permissions for files.

/usr/local/cpanel/3rdparty/bin/php

/usr/local/cpanel/3rdparty/bin/php-cgi

2) Above files should have 755 permissions. If  not then change the permission to 755.

3) Once the permissions are changed, execute the below command

/scripts/makecpphp

Now error should be fixed.

If you are getting a blank page on phpMyAdmin,You may check this article to resolve the blank page error on phpMyAdmin.