Getting rest API error

did you check the php logs of your local server? This should clearly state why that 500 error is thrown. 

There is nothing in Sugar log file

And the PHP  log file? That is where these kind of errors are logged 

as per this image here, I believe you're using our docker container to execute your local dev environment correct? if so, make sure all your containers are up and in the same network, you should have them all in a composer, they are totally dependent and will fail if any of those guys are down.

Hello I m also this kind of issue only but still i m not getting any solution

It looks like you are trying to get an oauth2 token with a GET request.

oauth2 is a POST request with a request body with five parameters, so you have to specify a body:

POST <your_path_to_sugar>/rest/v11_13/oauth2/token BODY

{
  "grant_type": "password",
  "client_id": "...",
  "client_secret": "",
  "username": "....",
  "password": "....",
  "platform": "...."
}