This is common error .. especially with Mountain Lion.
It can indicate the TC is just lost or is corrupted backups.
Hold the options key and click the top TM icon.. run verify backups.
If that fails because it cannot find the TC.. do a full network startup in correct order.. modem.. router/TC.. clients.. 2min gap.
Do a search for the error.. there are any number of posts.. I notice "More Like This" has gone completely to pot now with several errors listed except yours.
It says "Time Machine couldn’t verify your backups on “Rui's TC” because verification was interrupted."
Not sure how to solve this, the problem is with my iMac. My another MacPro 13" have no connection problem at all. Also, I am using the network created by TC. So it means that I am connected to the TC.
Is there anything else I can try?