Using classpath in json string causes npm start to crash

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In the json schemas in my project I use the word classpath when using $ref in order to allow schemas to reference other schemas. This causes doca to crash.

More detail:

My SampleKeyValueReferenceSchema.json file is the following

{
  "$ref": "classpath:samples/SampleKeyValueSchema.json"
}

SampleKeyValueSchema.json is another schema.

When I run npm start in the json schema folder that is generated, I get the following error:

Error: ENOENT: no such file or directory, open 'classpath:samples/SampleKeyValueSchema.json'
 @ ./schemas.js 13:1305-1393
 @ ./src/client/store.js
 @ ./src/client/index.js
 @ multi webpack-hot-middleware/client?path=http://192.168.2.18:8080/__webpack_hmr ./src/client/index.js

How do I solve this. Does this tool support classpath in json schema?