title: AVRO schema's JSON looks valid but returns Input is not a valid Avro schema
body: <p>I am trying to upload data to the user dataset in AWS Personalize. The schema contains the structure of my CSV. I checked it online for JSON and it shows valid JSON.</p>
  
  <pre><code>{
      "type": "record",
      "name": "Users",
      "namespace": "com.amazonaws.personalize.schema",
      "fields": [
          {
              "name": "user_id",
              "type": "string"
          },
          {
              "name": "address",
              "type": "record",
              "fields" : [
                  {"name": "address1", "type": "string"},
                  {"name": "address2", "type": "string"},
                  {"name": "city", "type": "string"},
                  {"name": "state", "type": "string"},
                  {"name": "postalCode", "type": "int"},
                  {"name": "coordinates", "type": "record",
                  "fields" : [
                      {"name": "lat", "type": "float"},
                      {"name": "lng", "type": "float"}
                      ]}
                      ]
          },
          {
              "name": "firstName",
              "type": "string"
          },
          {
              "name": "followRequestId",
              "type": "array",
              "items": "string"
          },
          {
              "name": "followers",
              "type": "array",
              "items": "string"
          },
          {
              "name": "fullName",
              "type": "string"
          },
          {
              "name": "gender",
              "type": "string"
          },
          {
              "name": "interests",
              "type": "array",
              "items": "string"
          },
          {
              "name": "lastActive",
              "type": "long"
          },
          {
              "name": "lastName",
              "type": "string"
          },
          {
              "name": "network",
              "type": "list"
          },
          {
              "name": "paymentDetails",
              "type": "int"
          },
          {
              "name": "personalOccasions",
              "type": "array",
              "items": "string"
          },
          {
              "name": "productLikeDislike",
              "type": "array",
              "items": "string"
          },
          {
              "name": "registrationDate",
              "type": "long"
          },
          {
              "name": "rewardId",
              "type": "string"
          },
          {
              "name": "wishList",
              "type": "array",
              "items": "string"
          }
      ],
      "version": "1.0"
  }
  </code></pre>