i think that might be the issue i do not need an image in my drop down. 
please see below what code is in my configuration:
 
{
"fontFamily": "Open Sans",
"fontSizes": {
"default": 14,
"small": 16,
"medium": 20,
"large": 50,
"extraLarge": 32
 },
"fontWeights": {
"default": 500,
"light": 100,
"bold": 1000
 },
"containerStyles": {
"default": {
"backgroundColor": "#FFFFFF",
"foregroundColors": {
"default": {
"normal": "#3a4356"
 },
"white": {
"normal": "#ffffff"
 },
"grey": {
"normal": "#9ea2ab"
 },
"orange": {
"normal": "#f2B900"
 },
"yellow": {
"normal": "#ffcb05"
 },
"black": {
"normal": "#000000"
 },
"lightGreen": {
"normal": "#3ADCCA"
 },
"green": {
"normal": "#54a254"
 },
"red": {
"normal": "#dd1111"
 },
"accent": {
"normal": "#2E89FC"
 },
"good": {
"normal": "#54a254"
 },
"warning": {
"normal": "#e69500"
 },
"attention": {
"normal": "#cc3300"
 }
 }
 }
 },
"imageSizes": {
"default": 40,
"small": 40,
"medium": 80,
"large": 160
 },
"imageSet": {
"imageSize": "medium",
"maxImageHeight": 100
 },
"actions": {
"color": "white",
"backgroundColor": "",
"maxActions": 5,
"spacing": "none",
"buttonSpacing": 20,
"actionsOrientation": "horizontal",
"actionAlignment": "left",
"showCard": {
"actionMode": "inline",
"inlineTopMargin": 16,
"style": "default"
 }
 },
"spacing": {
"default": 5,
"none": 0,
"small": 20,
"medium": 60,
"large": 20,
"extraLarge": 40,
"padding": 0
 },
"separator": {
"lineThickness": 3,
"lineColor": "#ffcb05"
 },
"factSet": {
"title": {
"size": "default",
"color": "default",
"weight": "bold",
"warp": true
 },
"value": {
"size": "default",
"color": "default",
"weight": "default",
"warp": true
 },
"spacing": 20
 },
"supportsInteractivity": true,
"height": 49,
"imageBaseUrl": ""
}