Problem: cannot use update manager

I was trying to upgrade Pidgin following this particular url:
http://www.kabatology.com/06/22/pidgin-2-5-7-for-ubuntu-fixes-yahoo-login-issues/

Now everytime that I try to open update manager or synaptic there is
this message:

E: Malformed line 1 in source list
/etc/apt/sources.list.d/pidgin-ppa.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.

any solution?
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