Trying to unistall somthing using RPM, getting error!

Hi, I'm trying to uninstall Amsn using rpm -e amsn and I'm getting this error:

error: cannot open lock file ///var/lib/rpm/RPMLOCK in exclusive mode
error: cannot open Packages database in /var/lib/rpm

Does anyone know what this means ?

Are you trying to uninstall it as root?

Yep...

Perhaps your database is messed up, try

Code:

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rpm --rebuilddb

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That worked, thanks!