Bin/buildout not working

as im running this command
bin/buildout
its not creating a instance file in the bin folder.

my code in buildout.cfg
parts =
instance
repozo
backup
zopepy
unifiedinstaller
mrbob

its also not creating mrbob file in bin folder.
i dont know how to solvw this problem.

indentation is important (though that may be due to the forum and cut and paste).

parts =
    instance
    repozo
    backup 
    zopepy
    unifiedinstaller

It will be helpful if you copied the whole buildout.cfg and the output message.

Without it, you could review the [instance] section and checkout the documentation of the recipe for clues about the problem.