Error:variable has intializer but incomplete type

i am trying to learn and write device driver on linux kernel 2.4 redhat distribution

iam getting compilation errors for driver code.
struct file_operations my_ops ={NULL,my_read,my_write,NULL,NULL,NULL NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,
NULL };

ERROR -> my_ops has intializer but incomplete type

Can anyone help me with this
Regards
Raman

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