Originally Posted by pdegoeje
Most likely your kernel sources are not in sync with the running kernel. Make sure you checked out (and compiled against) RELENG_8_0 sources.
Pdegoeje, thank you for your advice.
The problem is solved for your advice.
I had updated the src-tree to RELENG_8.
I did not know relations of src-tree and the nvidia driver kernel module.
Rhurlin, Nejdl, Pdegoeje
I'm grateful for your help.