The same happened for me twice already, still dont know the reason.
If you have backup copy of this file - instert installer dvd, boot into single user mode and copy the file back to where it should be. Thats how i fixed it the 2nd time.

For the 1st time i just reinstalled the system...cant propose anything else. Or you can recreate the file somehow ( or copy it from another system but have no idea if it would work )

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