Native vlan mismatch error msg from cdp

get this message from my 6509 connects to 3550. but no trunking is set between them. my other ports also have the same settings, with no err msg but have a native vlan unknown status... why???
this 6509 is not set by me.. :(

I do not have enough information from you to say if it is a bug. Past output of
sh ver
sh cdp neigh detail
sh int trunk
sh run int gigx/y or sh run int fas x/y

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