qacomplete rest api

Hi, i'm trying to access project defects, create defect and update defect , i'm using postman. i'm getting 404 response when i'm sending request. i am able to get valid response from project tests folder. 

ex: https://qacomplete.smartbear.com/rest-api/service/api/v2/projects/{ProjectId}/tests/defects

Body: {
"Title": "Error Finding Locations",
"Status": "New",
"Description": "System is throwing an error searching for the location ."
}

thanks