diff --git a/errors.go b/errors.go
index 332f8cf..d5fb676 100644
--- a/errors.go
+++ b/errors.go
@@ -3,7 +3,6 @@ package model
 import "git.milar.in/milarin/adverr"
 
 var (
-	ErrFeatureAlreadyCreated = adverr.NewErrTmpl("ErrFeatureAlreadyCreated", "duplicate feature: '%s'")
-	ErrFeatureWithoutValue   = adverr.NewErrTmpl("ErrFeatureWithoutValue", "feature needs a value: '%s'")
-	ErrInvalidFeatureValue   = adverr.NewErrTmpl("ErrInvalidFeatureValue", "feature needs a value of type %s")
+	ErrFeatureWithoutValue = adverr.NewErrTmpl("ErrFeatureWithoutValue", "feature needs a value: '%s'")
+	ErrInvalidFeatureValue = adverr.NewErrTmpl("ErrInvalidFeatureValue", "feature needs a value of type %s")
 )