Creating custom Blueprint - problem with connection with Context file

Hello,

I trying to create very simple custom Blueprint.

I create my environment and built a new project using

atlas-connect new Blueprint

as next I edited atlassian-connect.json by adding module “blueprints” like below:

"modules": {
        "blueprints": [
            {
                "template": {
                    "url": "/blueprints/blueprint.xml",
                    "blueprintContext": {
                        "url": "/blueprints/context"
                    }
                },
                "createResult": "edit",
                "description": {
                    "value": "This is a description."
                },
                "icon": {
                    "width": 48,
                    "height": 48,
                    "url": "/ico.png"
                },
                "name": {
                    "value": "Raport"
                },
                "key": "remote-blueprint"
            }
        ]


    },

As next I created “blueprints” directory and created inside two files: “blueprint.xml” and “context” with following content:

Blueprint.xml:

<h2 id="static1">Hello Blueprint</h2>
<h2 id="custom1"><at:var at:name="ContentPageTitle"/></h2>
<h2 id="custom2"><at:var at:name="custom-key1"/></h2>
<h2 id="custom3"><at:var at:rawxhtml="true" at:name="custom-key2"/></h2>

Context:

[
        {
        "identifier": "ContentPageTitle",
        "value": "Unique Page Title 1",
        "representation": "plain"
        },
        {
        "identifier": "custom-key1",
        "value": "custom value 1",
        "representation": "plain"
        },
        {
        "identifier": "custom-key2",
        "value": "<ac:structured-macro ac:name=\"cheese\" ac:schema-version=\"1\"/> ",
        "representation": "storage"
        }
]

After that I execute “npm start” command to register my Blueprint in my dev environment.
Then I trying to create page with my blueprint, then I received following error in console:

image

What is a reason of this situation and what I can resolve it?