diff --git a/manager/middlewares/error.go b/manager/middlewares/error.go
index c4c5c8d0573..a38d1fe7f6a 100644
--- a/manager/middlewares/error.go
+++ b/manager/middlewares/error.go
@@ -87,7 +87,7 @@ func Error() gin.HandlerFunc {
 		// GORM error handler
 		if errors.Is(err.Err, gorm.ErrRecordNotFound) {
 			c.JSON(http.StatusNotFound, ErrorResponse{
-				Message: http.StatusText(http.StatusNotFound),
+				Message: err.Error(),
 			})
 			c.Abort()
 			return
diff --git a/manager/service/job.go b/manager/service/job.go
index f68a445601b..f786eaaadff 100644
--- a/manager/service/job.go
+++ b/manager/service/job.go
@@ -186,7 +186,7 @@ func (s *service) findSchedulers(ctx context.Context, schedulerClusterIDs []uint
 		for _, schedulerClusterID := range schedulerClusterIDs {
 			schedulerCluster := models.SchedulerCluster{}
 			if err := s.db.WithContext(ctx).First(&schedulerCluster, schedulerClusterID).Error; err != nil {
-				return nil, err
+				return nil, fmt.Errorf("scheduler cluster id %d: %w", schedulerClusterID, err)
 			}
 
 			var schedulers []models.Scheduler
@@ -194,7 +194,7 @@ func (s *service) findSchedulers(ctx context.Context, schedulerClusterIDs []uint
 				SchedulerClusterID: schedulerCluster.ID,
 				State:              models.SchedulerStateActive,
 			}).Error; err != nil {
-				return nil, err
+				return nil, fmt.Errorf("scheduler cluster id %d: %w", schedulerClusterID, err)
 			}
 
 			activeSchedulers = append(activeSchedulers, schedulers...)
@@ -233,7 +233,7 @@ func (s *service) findCandidateSchedulers(ctx context.Context, schedulerClusterI
 		for _, schedulerClusterID := range schedulerClusterIDs {
 			schedulerCluster := models.SchedulerCluster{}
 			if err := s.db.WithContext(ctx).First(&schedulerCluster, schedulerClusterID).Error; err != nil {
-				return nil, err
+				return nil, fmt.Errorf("scheduler cluster id %d: %w", schedulerClusterID, err)
 			}
 
 			var schedulers []models.Scheduler
@@ -241,7 +241,7 @@ func (s *service) findCandidateSchedulers(ctx context.Context, schedulerClusterI
 				SchedulerClusterID: schedulerCluster.ID,
 				State:              models.SchedulerStateActive,
 			}).Error; err != nil {
-				return nil, err
+				return nil, fmt.Errorf("scheduler cluster id %d: %w", schedulerClusterID, err)
 			}
 
 			for _, scheduler := range schedulers {