Validation error even if it seems ok

[Adri-7]

I'm still getting the following error while my manifest seems ok:

Validation Error: sc:Canvas['label'] not present and required

It only returns one sequence with a single canvas which actually contains a label.

Below the canvas I'm trying to validate:

{
    "@context": "http://iiif.io/api/presentation/2/context.json",
    "@type": "sc:Manifest",
    "@id": "http://localhost:8079/api/presentation/7d338e96-66c3-4f8a-95da-3b512a66bd87/manifest",
    "label": "linly_simplifiee",
    "metadata": [
        {
            "label": "altLanguage",
            "value": "eng"
        }
    ],
    "sequences": [
        {
            "@context": "http://iiif.io/api/presentation/2/context.json",
            "@id": "http://localhost:8079/api/presentation/7d338e96-66c3-4f8a-95da-3b512a66bd87/sequence/default",
            "@type": "sc:Sequence",
            "label": "default",
            "canvases": [
                {
                    "@context": "http://iiif.io/api/presentation/2/context.json",
                    "@id": "http://localhost:8079/api/presentation/7d338e96-66c3-4f8a-95da-3b512a66bd87/canvas/539f068a-1591-42e2-9583-1c3017e2875a",
                    "@type": "sc:Canvas",
                    "label": "linly_1160-6398_1872_num_18_1_C_0001_0000",
                    "thumbnail": [
                        {
                            "@id": "http://localhost:8079/api/image/539f068a-1591-42e2-9583-1c3017e2875a/full/100,/0/default.png",
                            "@type": "dctypes:Image",
                            "service": [
                                {
                                    "@context": "http://iiif.io/api/image/2/context.json",
                                    "@id": "http://localhost:8079/api/image/539f068a-1591-42e2-9583-1c3017e2875a",
                                    "profile": [
                                        {
                                            "formats": [
                                                "jpg",
                                                "png"
                                            ],
                                            "qualities": [
                                                "default"
                                            ],
                                            "@id": "http://iiif.io/api/image/2/level1.json",
                                            "supports": [
                                                "regionByPx",
                                                "sizeByW",
                                                "sizeByH",
                                                "sizeByPct",
                                                "baseUriRedirect",
                                                "cors",
                                                "jsonldMediaType"
                                            ]
                                        }
                                    ],
                                    "protocol": "http://iiif.io/api/image"
                                }
                            ],
                            "format": {
                                "primaryType": "image",
                                "subType": "png",
                                "extensions": [
                                    "png"
                                ],
                                "typeName": "image/png"
                            }
                        }
                    ],
                    "images": [
                        {
                            "@type": "oa:Annotation",
                            "motivation": "sc:painting",
                            "resource": {
                                "@id": "http://localhost:8079/api/image/539f068a-1591-42e2-9583-1c3017e2875a/full/1000,/0/default.png",
                                "@type": "dctypes:Image",
                                "service": [
                                    {
                                        "@context": "http://iiif.io/api/image/2/context.json",
                                        "@id": "http://localhost:8079/api/image/539f068a-1591-42e2-9583-1c3017e2875a",
                                        "profile": [
                                            {
                                                "formats": [
                                                    "jpg",
                                                    "png"
                                                ],
                                                "qualities": [
                                                    "default"
                                                ],
                                                "@id": "http://iiif.io/api/image/2/level1.json",
                                                "supports": [
                                                    "regionByPx",
                                                    "sizeByW",
                                                    "sizeByH",
                                                    "sizeByPct",
                                                    "baseUriRedirect",
                                                    "cors",
                                                    "jsonldMediaType"
                                                ]
                                            }
                                        ],
                                        "protocol": "http://iiif.io/api/image"
                                    }
                                ],
                                "format": {
                                    "primaryType": "image",
                                    "subType": "png",
                                    "extensions": [
                                        "png"
                                    ],
                                    "typeName": "image/png"
                                }
                            },
                            "on": {
                                "@id": "http://localhost:8079/api/presentation/7d338e96-66c3-4f8a-95da-3b512a66bd87/canvas/539f068a-1591-42e2-9583-1c3017e2875a",
                                "@type": "sc:Canvas"
                            }
                        }
                    ],
                    "otherContent": [
                        {
                            "@id": "http://localhost:8079/api/presentation/7d338e96-66c3-4f8a-95da-3b512a66bd87/list/default",
                            "@type": "sc:AnnotationList",
                            "label": "default"
                        }
                    ],
                    "width": 150,
                    "height": 100
                }
            ]
        }
    ]
}