laravel spatie update direct permission to admin GuardDoesNotMatch

hi im updating the admin user direct permissions by this way but i get GuardDoesNotMatch error, i have seprate admins and users table and i set admin guard when admin log in.

   public function update(Request $request){

       // dd($request);

        $this->validate($request, [
            'user_id' => 'required',
            'permission_id' => 'required'
        ]);
        $user_id = $request->get('user_id');
        $user = User::findOrFail($user_id);

        $permissions  = $request->get('permission_id');

        if(!is_array($permissions)){
            $permissions = (array)$permissions;
        }
        $permissionArr = [];
        // Check if no permission selected.
        if(!empty($permissions)){
            foreach ($permissions as $permission) {
                $permissionArr[] = Permission::find($permission);
            }
        }
        $user->syncPermissions($permissionArr);

        return "success";
    }

ERROR:

message The given role or permission should use guard user, web, api instead of admin. exception Spatie\Permission\Exceptions\GuardDoesNotMatch

via Chebli Mohamed