Localhost is not coming

Thanks for the help you give to me.
mj flow
that possible
I use this flow,
I know this one is working all right untill ....?

localhost1880:/ui --> now answer
and now it is over
Other "good" flows give the same result
Dick

[
    {
        "id": "3c228f0a.b67bb",
        "type": "tab",
        "label": "Flow 1",
        "disabled": false,
        "info": ""
    },
    {
        "id": "2f186b5c.265464",
        "type": "ui_text",
        "z": "3c228f0a.b67bb",
        "group": "c58021d9.8f856",
        "order": 1,
        "width": 0,
        "height": 0,
        "name": "",
        "label": "text",
        "format": "{{msg.payload}}",
        "layout": "row-spread",
        "x": 300,
        "y": 180,
        "wires": []
    },
    {
        "id": "2a1e2b0f.b657b4",
        "type": "debug",
        "z": "3c228f0a.b67bb",
        "name": "gescheiden",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload",
        "targetType": "msg",
        "x": 300,
        "y": 100,
        "wires": []
    },
    {
        "id": "e097d8b1.fa9478",
        "type": "ui_button",
        "z": "3c228f0a.b67bb",
        "name": "",
        "group": "c58021d9.8f856",
        "order": 2,
        "width": 0,
        "height": 0,
        "passthru": false,
        "label": "button",
        "tooltip": "",
        "color": "",
        "bgcolor": "",
        "icon": "",
        "payload": "PA0DOW is aanwezig",
        "payloadType": "str",
        "topic": "",
        "x": 100,
        "y": 160,
        "wires": [
            [
                "2f186b5c.265464",
                "2a1e2b0f.b657b4",
                "c3829c48.13e21",
                "a25a2b2f.1994f8",
                "49912143.95976"
            ]
        ]
    },
    {
        "id": "2ba8a5e5.debeda",
        "type": "ui_slider",
        "z": "3c228f0a.b67bb",
        "name": "",
        "label": "slider",
        "tooltip": "",
        "group": "c58021d9.8f856",
        "order": 4,
        "width": 0,
        "height": 0,
        "passthru": true,
        "outs": "all",
        "topic": "",
        "min": 0,
        "max": "200",
        "step": 1,
        "x": 70,
        "y": 340,
        "wires": [
            [
                "87ca1575.1d0e28",
                "5ab26bd9.da1574",
                "27ea6190.2c3efe"
            ]
        ]
    },
    {
        "id": "87ca1575.1d0e28",
        "type": "ui_gauge",
        "z": "3c228f0a.b67bb",
        "name": "",
        "group": "c58021d9.8f856",
        "order": 5,
        "width": 0,
        "height": 0,
        "gtype": "donut",
        "title": "gauge",
        "label": "units",
        "format": "{{value}}",
        "min": 0,
        "max": "200",
        "colors": [
            "#00b500",
            "#e6e600",
            "#ca3838"
        ],
        "seg1": "75",
        "seg2": "150",
        "x": 290,
        "y": 380,
        "wires": []
    },
    {
        "id": "5ab26bd9.da1574",
        "type": "ui_chart",
        "z": "3c228f0a.b67bb",
        "name": "",
        "group": "c58021d9.8f856",
        "order": 6,
        "width": "0",
        "height": "0",
        "label": "chart",
        "chartType": "line",
        "legend": "false",
        "xformat": "HH:mm:ss",
        "interpolate": "linear",
        "nodata": "",
        "dot": false,
        "ymin": "",
        "ymax": "",
        "removeOlder": 1,
        "removeOlderPoints": "",
        "removeOlderUnit": "3600",
        "cutout": 0,
        "useOneColor": false,
        "useUTC": true,
        "colors": [
            "#1f77b4",
            "#aec7e8",
            "#ff7f0e",
            "#2ca02c",
            "#98df8a",
            "#d62728",
            "#ff9896",
            "#9467bd",
            "#c5b0d5"
        ],
        "useOldStyle": false,
        "outputs": 1,
        "x": 290,
        "y": 420,
        "wires": [
            []
        ]
    },
    {
        "id": "27ea6190.2c3efe",
        "type": "ui_chart",
        "z": "3c228f0a.b67bb",
        "name": "",
        "group": "c58021d9.8f856",
        "order": 7,
        "width": "0",
        "height": "0",
        "label": "chart",
        "chartType": "horizontalBar",
        "legend": "false",
        "xformat": "HH:mm:ss",
        "interpolate": "linear",
        "nodata": "",
        "dot": false,
        "ymin": "1",
        "ymax": "200",
        "removeOlder": 1,
        "removeOlderPoints": "",
        "removeOlderUnit": "3600",
        "cutout": "100",
        "useOneColor": false,
        "useUTC": false,
        "colors": [
            "#1f77b4",
            "#aec7e8",
            "#ff7f0e",
            "#2ca02c",
            "#98df8a",
            "#d62728",
            "#ff9896",
            "#9467bd",
            "#c5b0d5"
        ],
        "useOldStyle": false,
        "outputs": 1,
        "x": 290,
        "y": 460,
        "wires": [
            []
        ]
    },
    {
        "id": "c3829c48.13e21",
        "type": "ui_audio",
        "z": "3c228f0a.b67bb",
        "name": "",
        "group": "c58021d9.8f856",
        "voice": "nl-NL",
        "always": "",
        "x": 240,
        "y": 60,
        "wires": []
    },
    {
        "id": "a25a2b2f.1994f8",
        "type": "ui_toast",
        "z": "3c228f0a.b67bb",
        "position": "top right",
        "displayTime": "3",
        "highlight": "",
        "sendall": true,
        "outputs": 0,
        "ok": "OK",
        "cancel": "",
        "raw": false,
        "topic": "",
        "name": "",
        "x": 270,
        "y": 240,
        "wires": []
    },
    {
        "id": "49912143.95976",
        "type": "ui_template",
        "z": "3c228f0a.b67bb",
        "group": "c58021d9.8f856",
        "name": "",
        "order": 9,
        "width": 0,
        "height": 0,
        "format": "<div ng-bind-html=\"msg.payload\"></div>",
        "storeOutMessages": true,
        "fwdInMessages": true,
        "resendOnRefresh": true,
        "templateScope": "local",
        "x": 260,
        "y": 300,
        "wires": [
            []
        ]
    },
    {
        "id": "d240fcf5.a3cb6",
        "type": "comment",
        "z": "3c228f0a.b67bb",
        "name": "",
        "info": "l:\nnode-red/video/\nnode-red dashboard tutorial\n",
        "x": 240,
        "y": 20,
        "wires": []
    },
    {
        "id": "c58021d9.8f856",
        "type": "ui_group",
        "z": "",
        "name": "discreet",
        "tab": "6df95427.e159ec",
        "order": 1,
        "disp": true,
        "width": "6",
        "collapse": false
    },
    {
        "id": "6df95427.e159ec",
        "type": "ui_tab",
        "z": "",
        "name": "Demo",
        "icon": "dashboard",
        "disabled": false,
        "hidden": false
    }
]