[Rpm-maint] installation fails with md5sum error

[Tom Brown]

Hi

I have a custom rpm that builds fine and all it is is a directory that 
contains some plugins, nagiosn plugins.

When the rpm is installed i get the following error

error: unpacking of archive failed on file <filename>;48299d61: cpio: 
MD5 sum mismatch

Does anyone have any idea why this happens or how to avoid it as the 
source tarball that this rpm comes from unpacks fine so i am a little 
unsure.

thanks