diff --git a/parse_test.go b/parse_test.go
index 91aac3f..96ed579 100644
--- a/parse_test.go
+++ b/parse_test.go
@@ -188,8 +188,8 @@ func TestPagser_ParseDocument(t *testing.T) {
 	cfg := Config{
 		TagName:    "pagser",
 		FuncSymbol: "->",
-		CastError:  false,
-		Debug:      false,
+		CastError:  true,
+		Debug:      true,
 	}
 	p, err := NewWithConfig(cfg)
 	if err != nil {
diff --git a/tokenizer.go b/tokenizer.go
index 99cc41d..375ed84 100644
--- a/tokenizer.go
+++ b/tokenizer.go
@@ -53,7 +53,6 @@ func (p *Pagser) newTag(tagValue string) (*tagTokenizer, error) {
 	//tag.FuncParams = strings.Split(matches[2], ",")
 	params, err := parseFuncParamTokens(matches[3])
 	if err != nil {
-		fmt.Printf("`%v` is invalid: %v", tagValue, err)
 		return nil, fmt.Errorf("tag=`%v` is invalid: %v", tagValue, err)
 	}
 	tag.FuncParams = params