Reflection Mapping in OpenGL ES

I am trying to implement the reflection mapping in OpenGL ES 2.0 for 'sphere'. I have done the skybox. For sphere rendering, the reflection shaders i have used are:

Environment mapping (Sphere) vertex shader::

precision highp float;
uniform mat4    u_mvMatrix; // ModelView Matrix
uniform mat4    u_mvpMatrix; // ModelViewProjection Matrix

attribute vec4 a_position;
attribute vec3 a_envmapNormal;

varying vec3 v_eyecoordEyeReflection;

vec3 v_eyecoordPosition;
vec3 v_eyecoordNormal;

void main()
 {
    // position and normal in model coordinates
    vec4 modelCoordPosition = a_position;
    vec3 modelCoordNormal   = a_envmapNormal;

    // Calculate position in eye space
    v_eyecoordPosition = vec3(u_mvMatrix * modelCoordPosition);

    // Calculate and normalize eye space normal
    vec3 eyecoordNormal    = vec3(u_mvMatrix * vec4(modelCoordNormal, 0.0));
    v_eyecoordNormal        = normalize(eyecoordNormal);
    // Calculate reflection vector
    v_eyecoordEyeReflection = reflect(v_eyecoordPosition, v_eyecoordNormal);

    gl_Position = u_mvpMatrix * a_position;
}

Environment mapping (Sphere) Fragment shader

precision highp float;
uniform lowp samplerCube baseCubeMapTexture;
varying vec3 v_eyecoordEyeReflection;

void main()
{
    vec4 environmentColor = textureCube(baseCubeMapTexture, v_eyecoordEyeReflection);
    gl_FragColor = environmentColor;
}

But i am not getting any output. what is the error in the shader?