What does your /opt/kaltura/app/configurations/plugins.ini look like?
have you made any manual changes to it?
the errors above indicate you have some plugins that require other plugins which are not enabled.
"Pending plugin name [metadata] is not available," for instance, means that something needs it and yet the line:
"Metadata"
is missing from the file.
It is a mandatory plugin.
you can compare /opt/kaltura/app/configurations/plugins.ini with /opt/kaltura/app/configurations/plugins.template.ini to see whether or not things changed from the original.