WebGL Shader Fehler

Shader_Error

THREE.WebGLShader: gl.getShaderInfoLog() ERROR: 0:55: '*' :  wrong operand types  no operation '*' exists that takes a left-hand operand of type 'highp float' and a right operand of type 'const int' (or there is no acceptable conversion)

three.min.js:581 1: precision highp float;
2: precision highp int;
3:
4:
5: #define MAX_DIR_LIGHTS 0
6: #define MAX_POINT_LIGHTS 0
7: #define MAX_SPOT_LIGHTS 0
8: #define MAX_HEMI_LIGHTS 0
9: #define MAX_SHADOWS 0
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24:
25: #define USE_COLOR
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34:
35: uniform mat4 viewMatrix;
36: uniform vec3 cameraPosition;
37: 
38: // attribute float near;
39: // attribute float far;
40: float near = 1.0;
41: float far = 100000.0;
42: varying float vAlpha;
43: varying vec3 vColor;
44: varying float vDepth;
45: float zNear = near;
46: float zFar = far;
47:
48: void main() {
49: float z_b = vDepth;
50: float z_norm = (z_b - zNear) / (zFar - zNear);
51: float attenB = 0.45;
52: vec3 depthA=vec3(0);
53: if (z_norm > attenB)
54: {
55: float dA = (z_norm - attenB)*5;
56: depthA = vec3(dA);
57: }
58:   gl_FragColor = vec4(vColor.rgb+depthA, 1);
59:   gl_FragColor.a *= vAlpha;
60: }
61:
three.min.js:578 THREE.WebGLProgram: Could not initialise shader.
three.min.js:578 gl.VALIDATE_STATUS false
three.min.js:578 gl.getError() 0
three.min.js:578 THREE.WebGLProgram: gl.getProgramInfoLog() missing shaders