diff --git a/Form/Type/CkeditorType.php b/Form/Type/CkeditorType.php
index 0702e9f..6c1567c 100755
--- a/Form/Type/CkeditorType.php
+++ b/Form/Type/CkeditorType.php
@@ -35,7 +35,7 @@ public function buildForm(FormBuilderInterface $builder, array $options): void
             if (isset($this->transformers[$transformer_alias])) {
                 $builder->addViewTransformer($this->transformers[$transformer_alias]);
             } else {
-                throw new \Exception(sprintf("'%s' is not a valid transformer.", $transformer_alias));
+                throw new \Exception(\sprintf("'%s' is not a valid transformer.", $transformer_alias));
             }
         }