makeWebRequest invalid data response json?

This is my first attempt at building a simple widget and I am having difficulty with this particular error on the makeWebRequest command.

Invalid '$.Toybox.Lang.Method(responseCode as $.Toybox.Lang.Number, data as Null or $.Toybox.Lang.Dictionary) as Void' passed as parameter 4 of type 'PolyType<(callback(responseCode as $.Toybox.Lang.Number, data as Null or $.Toybox.Lang.Dictionary or $.Toybox.Lang.String) as Void) or (callback(responseCode as $.Toybox.Lang.Number, data as Null or $.Toybox.Lang.Dictionary or $.Toybox.Lang.String, context as $.Toybox.Lang.Object) as Void)>'.

Also the terminal shows the process was terminated with exit code: 105.

Any help would be appreciated. 

import Toybox.Application;
import Toybox.Lang;
import Toybox.WatchUi;
import Toybox.Communications;
import Toybox.System;
import Toybox.Graphics;
import Toybox.Time;

class BitcoinOnlyApp extends Application.AppBase {

    function initialize() {
        AppBase.initialize();
    }

    // onStart() is called on application start up
    function onStart(state as Dictionary?) as Void {
    makeRequest();
    }

    // onStop() is called when your application is exiting
    function onStop(state as Dictionary?) as Void {
    }

    // Return the initial view of your application here
    function getInitialView() as Array<Views or InputDelegates>? {
        return [ new BitcoinOnlyView("LOADING") ] as Array<Views or InputDelegates>;
    }

   // set up the response callback function
   function onReceive(responseCode as Number, data as Dictionary?) as Void {
       //Ui.switchToView(new GarminJSONWebRequestWidgetView("onReceive: " + URL + "\n" + responseCode + " " + data), null, Ui.SLIDE_IMMEDIATE);
        System.println(responseCode);
        System.println(data);
       //Get only the JSON data we are interested in and call the view class
       WatchUi.switchToView(new BitcoinOnlyView(data.get("usd")), null, WatchUi.SLIDE_IMMEDIATE);
    }

    function makeRequest() as Void {
       var url = "https://api.coingecko.com/api/v3/simple/price?";
       var params = {"ids" => "bitcoin",
                    "vs_currencies" => "usd"};
       var options = {
         :method => Communications.HTTP_REQUEST_METHOD_GET,
         :responseType => Communications.HTTP_RESPONSE_CONTENT_TYPE_JSON,
         :headers => {
            "Content-Type" => "Communications.REQUEST_CONTENT_TYPE_URL_ENCODED",
            "Accept" => "application/json"}
       };
    
       Communications.makeWebRequest(url, params, options, method(:onReceive));
    }

function getApp() as BitcoinOnlyApp {
    return Application.getApp() as BitcoinOnlyApp;
}
}