unstable下usblp模块加载出错

marvel

想驱动hp的usb打印机，在modprobe  usblp之后出错：
FATAL: Error inserting usblp (/lib/modules/2.6.18-1-686/kernel/drivers/usb/class/usblp.ko): Invalid module format

modprobe  －r usblp后dmsg的消息是

......
usb 2-2: new full speed USB device using uhci_hcd and address 5
usb 2-2: configuration #1 chosen from 1 choice
usblp: disagrees about version of symbol struct_module
lp: disagrees about version of symbol struct_module
ppdev: disagrees about version of symbol struct_module
usblp: disagrees about version of symbol struct_module
usblp: disagrees about version of symbol struct_module
usblp: disagrees about version of symbol struct_module

这是为什么呢？