erro: can't create transaction lock install .rpm

["Rildo" <delpino@xxxxxxxxx>]

HI, I am so Brazil

 

what does it mean when I do

#rpm -ivh sendmail-devel.rpm, it turns backs
with message " aviso: sendmail-devel-8.13.1-2.i386.rpm: V3 DSA signature: NOKEY, key ID 4f2a6fd2

erro: can't create transaction lock “

 

i need to help for problem.  

 

thank you

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