changes done to pass the error to validation function as string

app/Http/Controllers/Api/V1/APIController.php

@@ -198,8 +198,8 @@ class APIController extends Controller
      *
      * @return mix
      */
-    public function throwValidation($validation)
+    public function throwValidation($message)
     {
-        return ['error'=>$validation->errors()];
+        return ['error'=> $message];
     }
 }

app/Http/Controllers/Api/V1/PermissionController.php

@@ -62,7 +62,7 @@ class PermissionController extends APIController
     {
         $validation = $this->validatePermission($request);
         if ($validation->fails()) {
-            return $this->throwValidation($validation);
+            return $this->throwValidation($validation->messages()->first());
         }
         $this->repository->create($request->all());
 
@@ -82,7 +82,7 @@ class PermissionController extends APIController
         $validation = $this->validatePermission($request, $permission->id);
 
         if ($validation->fails()) {
-            return $this->throwValidation($validation);
+            return $this->throwValidation($validation->messages()->first());
         }
 
         $this->repository->update($permission, $request->all());

app/Http/Controllers/Api/V1/RolesController.php

@@ -61,7 +61,7 @@ class RolesController extends APIController
     {
         $validation = $this->validateRole($request);
         if ($validation->fails()) {
-            return $this->throwValidation($validation);
+            return $this->throwValidation($validation->messages()->first());
         }
 
         $this->repository->create($request->all());
@@ -82,7 +82,7 @@ class RolesController extends APIController
         $validation = $this->validateRole($request);
 
         if ($validation->fails()) {
-            return $this->throwValidation($validation);
+            return $this->throwValidation($validation->messages()->first());
         }
 
         $this->repository->update($role, $request->all());

app/Http/Controllers/Api/V1/UsersController.php

@@ -62,7 +62,7 @@ class UsersController extends APIController
         $validation = $this->validateUser($request);
 
         if ($validation->fails()) {
-            return $this->throwValidation($validation);
+            return $this->throwValidation($validation->messages()->first());
         }
 
         $this->repository->create($request);
@@ -83,7 +83,7 @@ class UsersController extends APIController
         $validation = $this->validateUser($request, 'edit', $user->id);
 
         if ($validation->fails()) {
-            return $this->throwValidation($validation);
+            return $this->throwValidation($validation->messages()->first());
         }
 
         $updatedUser = $this->repository->update($user, $request);