Getting 500 Internal Server Error while creating Eloqua form with multiple fields using Rest API.

I have a requirement to support forms of Oracle Eloqua Marketing Cloud Service in my project. I was testing the rest api for forms. So when I create form with single field using the create endpoint form is created in Eloqua CMS. But when I try to create form with Muliple fields it throws 500 InternalServerError.

Endpoint: REST/2.0/assets/form

Request Body: {

"name":"ELA_Form", "elements":[ { "type": "FormField", "name": "Address 1", "style": "{\"fieldSize\":\"large\",\"labelPosition\":\"top\"}", "createdFromContactFieldId": "100006", "dataType": "text", "displayType": "text", "fieldMergeId": "36", "htmlName": "address1", "useGlobalSubscriptionStatus": "False", "validations": [] }, { "type": "FormField", "name": "Address 2", "style": "{\"fieldSize\":\"large\",\"labelPosition\":\"top\"}", "createdFromContactFieldId": "100007", "dataType": "text", "displayType": "text", "fieldMergeId": "37", "htmlName": "address2", "useGlobalSubscriptionStatus": "False", "validations": [] } ], "processingType":"externalEmail" }