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vec3 uniforms array into shader


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I would like to create an array of colors in my shader code. What is the correct way to do this. Apparently you can't code this directly into the shader, but doing it via uniforms is supposed to work. The following code I have returns this error message in the console:

Pixi.js Shader Warning: Unknown uniform type: undefined

This is my shader code:

precision mediump float;
uniform vec3 cols[127];
uniform float screenHeight; 
uniform float screenWidth; 
void main(){
    //Not implemented yet
    gl_FragColor =vec4(1.0,1.0,1.0,1.0);

And my JS code which is supposed to set up the uniforms:

uniforms.screenHeight = {type:"f",value:dims.width};
uniforms.screenWidth = {type:"f",value:dims.height};
var cols =["0B5624", /* 125 more colors*/ "5B5A57"];
var mycols = [cols.length] ;
for(var i=0; i<cols.length; i++){
     mycols[i] = {type: "v3v", value:[(hexToR(cols[i])/256).toFixed(2),
uniforms.cols = mycols;
shady = new PIXI.AbstractFilter('',myShaderCode,uniforms);


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