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To add my 2-cents worth (c'mon - you knew I would) ...
These are notices - not errors that will cause a major malfunction. The first you described can be fixed by properly configuring your Joomla global configuration options.
You can make them both go away and be blissfully unaware of such things eternally by setting your php error flag a little lower.
I'm sorry - it's been a big day for me. This is the second bum answer I've given in the last 24 hours.
SO ...
$mosConfig_absolute_path should be getting set automatically by your includes/legacy.php file - and it does look as though you already have that plugin activated ... so not sure what's going on there.
But, what I said about error_reporting still holds true, and that information is
here
.