fix error message of custrom resource validation

staging/src/k8s.io/apiextensions-apiserver/pkg/registry/customresource/strategy.go

@@ -135,7 +135,7 @@ func (a customResourceValidator) Validate(ctx genericapirequest.Context, obj run
 		return field.ErrorList{field.Invalid(field.NewPath("kind"), typeAccessor.GetKind(), fmt.Sprintf("must be %v", a.kind.Kind))}
 	}
 	if typeAccessor.GetAPIVersion() != a.kind.Group+"/"+a.kind.Version {
-		return field.ErrorList{field.Invalid(field.NewPath("apiVersion"), typeAccessor.GetKind(), fmt.Sprintf("must be %v", a.kind.Group+"/"+a.kind.Version))}
+		return field.ErrorList{field.Invalid(field.NewPath("apiVersion"), typeAccessor.GetAPIVersion(), fmt.Sprintf("must be %v", a.kind.Group+"/"+a.kind.Version))}
 	}
 
 	customResourceObject, ok := obj.(*unstructured.Unstructured)
@@ -169,7 +169,7 @@ func (a customResourceValidator) ValidateUpdate(ctx genericapirequest.Context, o
 		return field.ErrorList{field.Invalid(field.NewPath("kind"), typeAccessor.GetKind(), fmt.Sprintf("must be %v", a.kind.Kind))}
 	}
 	if typeAccessor.GetAPIVersion() != a.kind.Group+"/"+a.kind.Version {
-		return field.ErrorList{field.Invalid(field.NewPath("apiVersion"), typeAccessor.GetKind(), fmt.Sprintf("must be %v", a.kind.Group+"/"+a.kind.Version))}
+		return field.ErrorList{field.Invalid(field.NewPath("apiVersion"), typeAccessor.GetAPIVersion(), fmt.Sprintf("must be %v", a.kind.Group+"/"+a.kind.Version))}
 	}
 
 	customResourceObject, ok := obj.(*unstructured.Unstructured)