php echo from json file - Undefined index

please I have problem with php echo from json file:

[
    {     
         "displayName":"Sample Name",
         "displayAssets":[
            {
               "displayAsset":"x_1235s",
               "url":"https://website.com/image1.png",
               "background":"https://website.com/bg1.png"
            }
         ],
         "Date":"2021-06-12",
         "price":{
            "regularPrice":1600,
            "finalPrice":1600
         },
    }
]
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When I php echo

echo $item['displayName'];
echo number_format( $item['price']['regularPrice'] );
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it works fine, but

echo $item['displayAssets']['url']; 
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show me this error -> Notice: Undefined index: url in ..

Thank all

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