error message when opening synaptic source list line 57

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http://askubuntu.com – it seems there is a problem in my source list which I cant find; everytime I try to open synaptic this error appears: E: Malformed line 57 in source list /etc/apt/sources.list (dist parse) E: The list of sources could not be read. Go to the repository dialog to correct the problem. E: _cache->open() failed, please report. on opening my source list, line 57 doesnt seem to exist, this is it; (Im a new user and can only post two hyperlinks - these are the last two lines and I suspect one of them is the problem...) deb-src http://extras.ubuntu.com/ubuntu quantal main deb-src http://archive.can (HowTos)