add error response of endpoint

input.yml

@@ -27,20 +27,39 @@ paths:
                   format: binary
       responses:
         '200':
-          description: Status message
+          description: OK Message
           content:
             application/json:
               schema:
                 type: array
                 items:
-                  $ref: '#/components/schemas/Response'
+                  $ref: '#/components/schemas/OK'
+        '416':
+          description: Media type error
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: '#/components/schemas/Error'
 
 components:
   schemas:
-    Response:
+    OK:
       properties:
         status:
           type: string
           description: "Status message from backend."
       required:
-        - status
+        - status
+    Error:
+      properties:
+        status:
+          type: string
+          description: "Status message from backend."
+        message:
+          type: string
+          description: "Error message"
+      required:
+        - status
+        - message