build error
----build Log---
:1:1: error: unknown type name '_kernel'
_kernel void hello(_global float * input ,_ global float *output)
^
:1:9: error: expected identifier or '('
_kernel void hello(_global float * input ,_ global float *output)
^
2 diagnostics generated.

error: front end compiler failed build.

i m using windows 7(64 bit )+ms visual studio 2010 on nvidia
how this problem can be solved?????