diff --git a/restservice/src/main/java/com/plannaplan/controllers/GroupController.java b/restservice/src/main/java/com/plannaplan/controllers/GroupController.java
index b7afa55..478b6c1 100755
--- a/restservice/src/main/java/com/plannaplan/controllers/GroupController.java
+++ b/restservice/src/main/java/com/plannaplan/controllers/GroupController.java
@@ -6,7 +6,6 @@ import com.plannaplan.App;
 import com.plannaplan.entities.Groups;
 import com.plannaplan.responses.mappers.GroupsMappers;
 import com.plannaplan.responses.models.DefaultGroupResponse;
-import com.plannaplan.responses.models.WithCapacityGroupResponse;
 import com.plannaplan.services.GroupService;
 
 import org.springframework.beans.factory.annotation.Autowired;
@@ -18,8 +17,6 @@ import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
-import io.vavr.control.Either;
-
 @RestController
 @CrossOrigin
 @RequestMapping("/api/" + App.API_VERSION + "/groups")
@@ -28,12 +25,12 @@ public class GroupController {
     private GroupService groupService;
 
     @GetMapping("/getCourseGroups")
-    public ResponseEntity<Either<List<WithCapacityGroupResponse>, List<DefaultGroupResponse>>> getCourses(
-            @RequestParam("id") Long id, @RequestParam(name = "capacity", defaultValue = "true") Boolean capacity) {
+    public ResponseEntity<List<? extends DefaultGroupResponse>> getCourses(@RequestParam("id") Long id,
+            @RequestParam(name = "capacity", defaultValue = "true") Boolean capacity) {
         List<Groups> groups = this.groupService.getGroupsByCourse(id);
         if (capacity) {
-            return new ResponseEntity<>(Either.left(GroupsMappers.mapToCapacityResponse(groups)), HttpStatus.OK);
+            return new ResponseEntity<>(GroupsMappers.mapToCapacityResponse(groups), HttpStatus.OK);
         }
-        return new ResponseEntity<>(Either.right(GroupsMappers.mapToDefaultResponse(groups)), HttpStatus.OK);
+        return new ResponseEntity<>(GroupsMappers.mapToDefaultResponse(groups), HttpStatus.OK);
     }
 }
\ No newline at end of file