Get Token using OAuth2,0

I am new to SoapUI....Unable to get token using client credentials grant...but the same works fine in Postman

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Fri Aug 14 14:20:00 EDT 2020:ERROR:Error retrieving OAuth 2 access token
Fri Aug 14 14:20:00 EDT 2020:ERROR:com.eviware.soapui.impl.rest.actions.oauth.OAuth2Exception: org.apache.oltu.oauth2.common.exception.OAuthSystemException: OAuthProblemException{error='unsupported_response_type', description='Invalid response! Response body is not application/json encoded', uri='null', state='null', scope='null', redirectUri='null', responseStatus=0, parameters={}}
   com.eviware.soapui.impl.rest.actions.oauth.OAuth2Exception: org.apache.oltu.oauth2.common.exception.OAuthSystemException: OAuthProblemException{error='unsupported_response_type', description='Invalid response! Response body is not application/json encoded', uri='null', state='null', scope='null', redirectUri='null', responseStatus=0, parameters={}}