Remove interface type from annotations.Ingress struct

internal/ingress/annotations/annotations.go

@@ -80,7 +80,8 @@ type Ingress struct {
 	CorsConfig           cors.Config
 	CustomHTTPErrors     []int
 	DefaultBackend       *apiv1.Service
-	Denied               error
+	//TODO: Change this back into an error when https://github.com/imdario/mergo/issues/100 is resolved
+	Denied               string
 	ExternalAuth         authreq.Config
 	HTTP2PushPreload     bool
 	Proxy                proxy.Config
@@ -182,7 +183,7 @@ func (e Extractor) Extract(ing *extensions.Ingress) *Ingress {
 
 			_, alreadyDenied := data[DeniedKeyName]
 			if !alreadyDenied {
-				data[DeniedKeyName] = err
+				data[DeniedKeyName] = err.Error()
 				klog.Errorf("error reading %v annotation in Ingress %v/%v: %v", name, ing.GetNamespace(), ing.GetName(), err)
 				continue
 			}