Issue with ESRI API RasterFunction Arithmetic

I am not sure if this is the right place, but I'll post here anyway. Anyway as the title says I would like some help with this code block that I am writing. Basically what I am trying to do is create an application that can do simple map algebra using two rasters. This is accomplished using ESRI's API. I will include the code block at the bottom. It is filled with comments about the code and where the issue is occurring. Basically the issue I am running into is that after reclassification of the two rasters is complete, I am trying to multiply them together using the RasterFunction = "Arithmetic". The issue is that they are not multiplying and I get an error that reads: "{"error":{"code":400,"message":"Invalid or missing input parameters.","details":[]}}" If someone could take a look at my code block and may point me in the right direction or give me guidance that would be great! Also note that I am not an expert programmer by any means so this is a very rough code block. Code Block:

require(["dojo/parser",
  "esri/layers/ArcGISImageServiceLayer", "esri/layers/ImageServiceParameters",
  "esri/layers/RasterFunction", "esri/map", "dijit/layout/BorderContainer",
  "dijit/layout/ContentPane"], 
  function(parser, ArcGISImageServiceLayer, ImageServiceParameters, RasterFunction, Map) {     
    parser.parse();

    var map = new Map("map", {
        basemap:"topo",
        center:[-84.25, 42.6], 
        zoom: 11
    });
    ////parameters for reclassifying DEM
    var params = new ImageServiceParameters(); //creates new ImageServiceParameter object
    var reclass_dem = new RasterFunction(); // creates new RasterFunction called reclass_dem
    reclass_dem.functionName = "Remap"; //sets reclass_dem function to "Remap"
    var functionArguments_dem = {}; //creates object called functionArguments_dem
    functionArguments_dem.InputRanges = [802.2,900]; //creates input range function argument for reclass_dem
    functionArguments_dem.OutputValues = [1]; //creates output values function argument for reclass_dem
    functionArguments_dem.AllowUnmatched = false; //creates no data values for any values outside input range; funciton argument        

    reclass_dem.functionArguments = functionArguments_dem; //sets functionArguments_dem to reclass_dem's function arguments

    //reclass_dem.variableName = "Raster"; //sets reclass_dem object variable to "Raster" type
    params.renderingRule = reclass_dem; //sets params object renderingRule to reclass_dem function arguments

    //parameters for reclassifying LandCover 
    var params_land = new ImageServiceParameters(); //creates new ImageServiceParameter object
    var reclass_landcov = new RasterFunction(); //creates new RasterFunction  called reclass_landcov
    reclass_landcov.functionName = "Remap"; //sets reclass_landcov function to "Remap"
    var functionArguments_lc = {}; //creates object called functionArguments_lc
    functionArguments_lc.InputRanges = [10,30];  //creates input range function argument for reclass_landcov
    functionArguments_lc.OutputValues = [1]; //creates output values function argument for reclass_landcov
    functionArguments_lc.AllowUnmatched = false; //creates no data values for any values outside input range; funciton argument     

    reclass_landcov.functionArguments = functionArguments_lc; //sets functionArguments_lc to reclass_landcov's function arguments

    //reclass_landcov.variableName = "Raster"; //sets reclass_landcov object variable to "Raster" type
    params_land.renderingRule = reclass_landcov; //sets params object renderingRule to reclass_landcov function arguments


    //STUCK HERE! RECLASSIFIED RASTERS WON'T 
    //MULTIPLY TOGETHER; GIVE ERROR/WONT DISPLAY IMAGE
    //Multiply rasters
    var params_suit = new ImageServiceParameters(); //creates new ImageServiceParameter object
    var suit = new RasterFunction(); //creates new RasterFunction called suit
    suit.functionName = "Arithmetic"; //sets reclass_landcov function to "Arithmetic"
    var functionArguments_alge = {}; //creates object called functionArguments_alge
    functionArguments_alge.Raster = "params_land"; //renderRule object for landcover reclass
    functionArguments_alge.Raster2 = "params"; //renderRule object for elevation reclass
    functionArguments_alge.Operation = 3; //multiplication operation (1 = +)(2 = -)(3 = *)

    suit.functionArguments = functionArguments_alge; //sets functionArguments_lc to suit's function arguments
    params_suit.renderingRule = suit; //sets params object renderingRule to suit function arguments


    var dem = new ArcGISImageServiceLayer("http://ift.tt/1BcETKW",{imageServiceParameters:params_suit});
    var landcov = new ArcGISImageServiceLayer("http://ift.tt/19MgTaX", {imageServiceParameters:params_suit});
    map.addLayers([dem,landcov]);
    dojo.connect(map, 'onLoad', function(theMap) {
      //resize the map when the browser resizes
      dojo.connect(dijit.byId('map'), 'resize', map,map.resize);
    });     
  });