Vertex shader does not work on galaxy tab10 (tegra 2)

I created an application that uses GLES2.0 on HTC Desire S. It works on HTC, but not on the Samung Galaxy tab. 10.1. The program cannot be connected (GLES20.glGetProgramiv (mProgram, GLES20.GL_LINK_STATUS, linOk, 0) gives -1) and glGetError () gives me error 1282 (Invalid operation).

When I replace this line (in the shader):

graph_coord.z = (texture2D(mytexture, graph_coord.xy / 2.0 + 0.5).r);

by

graph_coord.z = 0.2;

It also works on the galaxy tab. My shader is as follows:

 private final String vertexShaderCode =
"attribute vec2 coord2d;" +
"varying vec4 graph_coord;" +
"uniform mat4 texture_transform;" + 
"uniform mat4 vertex_transform;" +
"uniform sampler2D mytexture;" +
"void main(void) {" +
"  graph_coord = texture_transform * vec4(coord2d, 0, 1);" +
"  graph_coord.z = (texture2D(mytexture, graph_coord.xy / 2.0 + 0.5).r);" + 
"  gl_Position = vertex_transform * vec4(coord2d, graph_coord.z, 1);" + 
"}";

Where the shaders are attached:

  mProgram = GLES20.glCreateProgram();             // create empty OpenGL Program
  GLES20.glAttachShader(mProgram, vertexShader);   // add the vertex shader to program
  GLES20.glAttachShader(mProgram, fragmentShader); // add the fragment shader to program
  GLES20.glLinkProgram(mProgram);                  // create OpenGL program executables
  int linOk[] = new int[1];
  GLES20.glGetProgramiv(mProgram, GLES20.GL_LINK_STATUS, linOk,0);

And the texture is loaded here:

 GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, texture_id[0]);
 GLES20.glTexImage2D(
        GLES20.GL_TEXTURE_2D,   // target
    0,                  // level, 0 = base, no minimap,
    GLES20.GL_LUMINANCE,       // internalformat
    size,                  // width
    size,                  // height
    0,                  // border, always 0 in OpenGL ES
    GLES20.GL_LUMINANCE,       // format
    GLES20.GL_UNSIGNED_BYTE,   // type
    values
 );