dpkg serious warning ? help please ...

[Mehmet Fatih Akbulut]

hi all,
i tried to install a deb package named 'lale', but installation process failed.
then tried couple of times again. each time got same error and stopped installing that package.
but since then, when i try to install another package or run apt-get, i get dpkg errors related to that package 'lale'.
[errors indicate that 1 not completely installed or removed package i had.]
so finally i decided to purge everything under /var/lib/dpkg/info that start with lale ;)
and know i get another error which is :
dpkg: serious warning: files list file for package `lale' missing, assuming package has no files currently installed.
how can i fix such errors ?
what should i do when an installation process goes wrong ? how should i reconfigure dpkg ?
many thanks in advance.

Cheers,
MFA