texelFetch on sampler2DMS not avaliable on ATI

I tried to implement MSAA deferred lighting
on OpenGL 3.2 but texelFetch function give me problem

My video card is HD4670 with the latest 10.1 driver

#version 150 core
precision highp float;

uniform sampler2DMS normalTexture;
in vec2 intTexCoord;

for(int i=0;i<2;i++){
 vec4 normalColor = texelFetch(normalTexture,intTexCoord,i);

the snippet of code above alway give me “texelFetch no overload function”

Thank in advance.

Problem solved.

After carefully reading GLSL 1.5 spec,texelFetch only allow integer texture coordinate.