BackgroundImage not changingSolved

Hi All.

I have the most standard config. Where i just have remove the 2nd and 3th page. But keept all the tabs.

I have tried following change
"BackgroundImage": {
"Enabled": false,
"Position": {
"MinX": 0.0,
"MaxX": 1.0,
"MinY": 0.0,
"MaxY": 1.0
},
"Url": "http://7-themes.com/data_images/out/35/6889756-black-backgrounds.jpg",
"TransparencyInPercent": 100

To change it to

"BackgroundImage": {
"Enabled": True,
"Position": {
"MinX": 0.0,
"MaxX": 1.0,
"MinY": 0.0,
"MaxY": 1.0
},
"Url": "http://tonny-petersen.dk/RustBG.png",
"TransparencyInPercent": 100

So basically just changed the URL and set it to true. - But i get an error.

Have i missed something

Tried to write the link. and not just copy/paste the link. And it worked.
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