{
"Command": "skin",
"Skins": [
{
"Item Shortname": "shortname",
"Skins": [
0
]
},
{
"Item Shortname": "p",
"Skins": [
0,
1838926976
]
}
],
"Container Panel Name": "generic",
"Container Capacity": 36,
"UI": {
"Background Color": "0.18 0.28 0.36",
"Background Anchors": {
"Anchor Min X": "1.0",
"Anchor Min Y": "1.0",
"Anchor Max X": "1.0",
"Anchor Max Y": "1.0"
},
"Background Offsets": {
"Offset Min X": "-300",
"Offset Min Y": "-100",
"Offset Max X": "0",
"Offset Max Y": "0"
},
"Left Button Text": "<",
"Left Button Color": "0.11 0.51 0.83",
"Left Button Anchors": {
"Anchor Min X": "0.025",
"Anchor Min Y": "0.05",
"Anchor Max X": "0.325",
"Anchor Max Y": "0.95"
},
"Center Button Text": "Page: {page}",
"Center Button Color": "0.11 0.51 0.83",
"Center Button Anchors": {
"Anchor Min X": "0.350",
"Anchor Min Y": "0.05",
"Anchor Max X": "0.650",
"Anchor Max Y": "0.95"
},
"Right Button Text": ">",
"Right Button Color": "0.11 0.51 0.83",
"Right Button Anchors": {
"Anchor Min X": "0.675",
"Anchor Min Y": "0.05",
"Anchor Max X": "0.975",
"Anchor Max Y": "0.95"
}
},
"Debug": false
}

Add skins to configuration first or with a command

i did that /skin add lr 1883559335 still cant 

Shortname is incorrect, that's your error. Please, use correct shortnames.