WARNING: Error inserting 8250 (/lib/modules/2.6.16-xen/kernel/drivers/serial/8250.ko): Unknown symbol in module, or unknown parameter (see dmesg)

FATAL: Error inserting 8250_pci (/lib/modules/2.6.16-xen/kernel/drivers/serial/8250_pci.ko): Unknown symbol in module, or unknown parameter (see dmesg)

modprobe: FATAL: Error inserting 8250 (/lib/modules/2.6.16-xen/kernel/drivers/serial/8250.ko): Unknown symbol in module, or unknown parameter (see dmesg)