[ubuntu] Error inserting mac80211 module

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http://ubuntuforums.org – Dear All, I modify a header file in include/linux and then "make modules" until the end. After that I "make modules_install". And then I try to copy the .ko file to /lib/modules/3.5.0 directory, after that I remove the older module rmmod mac80211 and load new module modprobe -v mac80211 but after that the error occured "FATAL: Error inserting mac80211 (/lib/modules/3.5.0+/kernel/net/mac80211/mac80211.ko): Invalid argument" what should I do? T_T I usually use that method (from copy to modprobe) and there is no problem but today this problem occured. Need (Hardware)