No response for few Modules of SugarCRM in Postman

Hi Team,

When we are trying to execute GET for below listed module in postman we are getting response as 403 Forbidden,404 Not Found, Internal Server Error 500.

Module Name: Response

1.Audit : Internal Server Error 500.

2.Calendar,ProductCategories,Feeds,Queues,Worksheet :  404 Not Found

3.Bugs,Project,ProjectTask,Releases,Cases,WorkFlow : 403 Forbidden 

I have cross verified with metadata api call in postman for list modules, i am not getting  Number 3 modules (which is showing 403 ) in response .

and for Number 2(404 response) modules: not getting field under fields in metadata API call response.

Please provide some clarification for it.