Software management is locked

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http://forums.opensuse.org – hi i m trying to install software, but when i open "install software", the following message displayed. Accessing Package Management Failed System management is locked by the application with pid 6104(/usr/sbin/packagekitd). Close this application before trying again. Would you like to abort or try again? Abort Retry and one more thing how to open "*.ymp" file, earlier when i downloaded this type of file, it automatically get opened with install software, but its not happening now. SOS!!! (Distributions)