FC6 error at start--vdevd add_to_rules unknow_key ...

Hi

When vdevd starts at booting FC6, there is error messenge as follows,

vdevd
add_to_rules[403] unknown_key ATTRS{idProduct}

It repeated a few rows. What does it mean?

And, this messenge flashs very quick, It took about 5 reboots to gather this error messenge. The 2nd question is how to capture the error messenge at the beginning of system boot?

Thanks

Yuandan