Hello, Brahim.
This error message does not mean that you experience any problem updating Linux Mint 14 at all.
All that this error message tells is that a particular PPA repository cannot be contacted.
Going to this address,
http://ppa.launchpad.net/venerix/, I see a subfolder
blug-deletedppa, but no more folder
blug. This seems to suggest that indeed the PPA does no longer exist.
Visit this page:
https://launchpad.net/+search?field.text=venerix and search for venerix. Find out whether the PPA repository has just been moved to a different location or whether it has stopped existing.
Correct the list of your repositories accordingly.
Karl