[Error]: Please provide the uri (either ARN or function name if using Lambda) for custom/default.

I took template skill after ASK(Alexa Skill Kit) setup and was trying to deploy that skill, and skill deployment was failing with following error:

"[Error]: Please provide the uri (either ARN or function name if using Lambda) for custom/default."

I edited apis section in my skill.json to add uri section as   "ask-custom-fact-default"   and skill was deployed successfully and lambda was created with name "ask-custom-fact-default" in my aws account.

    "apis": {
      "custom": {
        "endpoint": {
          "sourceDir": "lambda/custom",
          "uri": "ask-custom-fact-default"
        }
      }
    },