"Request Should Have succeeded, but was "400 Bad Request" error on Robotframework-httpLibrary

I am using Robotframework-httplibrary for automating my webservice API, which has Header and Request body. Manually If I test these APIs using REST Client, the APIs works fine. However, from my Robot framework Testcase it fails.

I understand that the error is with testcase syntax or with the interpretor..python2.7(may be it is not supported)

Below is the test script:

*** Settings***  
Library      HttpLibrary.HTTP  
*** Test Cases ***  

Test Create Process       Set Request Header    clientID: vg_site1
                      Set Request Body      {"               "}
                      POST               http://localhost:portno/application
                      Response Status Code Should Equal   200 OK

output:Request should have succeeded, but was "400 Bad Request"