System.map does not match kernel data

[omicron <omicron@omicron.dyndns.org>]

hello
	when i do `ps` , i get the following error message on stderr...

{inet_release} {inet_release_R__ver_inet_release}
Warning: /boot/System.map-2.4.2 does not match kernel data.
{inet_release} {inet_release_R__ver_inet_release}
Warning: /boot/System.map does not match kernel data.
{inet_release} {inet_release_R__ver_inet_release}
Warning: /usr/src/linux/System.map does not match kernel data.

	what does it mean ? I *did* compile (and recompile ) my kernel a
dozen times..is it because of that ?

Thanks in advance..

regards
omicron

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