Traefik on a Kubernetes Cluster always returning Internal Server Error

Question

I am new in kubernetes world, and I wish to use Traefik to make a reverse proxy to my services (with HTTPS). I followed the whole instructions from official Traefik website and It does not work, It keeps saying Internal server error when I try to access my service.

Ps: The Traefik dashboard is working fine... I think maybe it is a problem with the TLS configurations on my cluster, but I already tried everything I found on the internet and It doesn't work.

traefik-deployment.yml

---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: traefik-ingress-controller
  namespace: kube-system
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: traefik-ingress-controller
  namespace: kube-system
  labels:
    k8s-app: traefik-ingress-lb
spec:
  replicas: 1
  selector:
    matchLabels:
      k8s-app: traefik-ingress-lb
  template:
    metadata:
      labels:
        k8s-app: traefik-ingress-lb
        name: traefik-ingress-lb
    spec:
      serviceAccountName: traefik-ingress-controller
      terminationGracePeriodSeconds: 60
      containers:
        - image: traefik:1.7.12
          name: traefik-ingress-lb
          ports:
            - name: http
              containerPort: 80
            - name: https
              containerPort: 443
            - name: admin
              containerPort: 8080
          args:
            - --api
            - --kubernetes
            - --logLevel=INFO
            - --defaultentrypoints=http,https
            - --entrypoints=Name:https Address::443 TLS
            - --entrypoints=Name:http Address::80
            - --insecureSkipVerify=true
---
apiVersion: v1
kind: Service
metadata:
  name: traefik-ingress-service
  namespace: kube-system
spec:
  selector:
    k8s-app: traefik-ingress-lb
  ports:
    - protocol: TCP
      port: 80
      name: web
    - protocol: TCP
      port: 443
      name: web-secure
    - protocol: TCP
      port: 8080
      name: admin
  type: LoadBalancer

ui.yml

apiVersion: v1
kind: Service
metadata:
  name: traefik-web-ui
  namespace: kube-system
spec:
  selector:
    k8s-app: traefik-ingress-lb
  ports:
    - name: web
      port: 80
      targetPort: 8080
    - name: web-secure
      port: 443
      targetPort: 8080
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: traefik-web-ui
  namespace: kube-system
  annotations:
    kubernetes.io/ingress.class: traefik
spec:
  rules:
    - host: traefik.localhost
      http:
        paths:
          - backend:
              serviceName: traefik-web-ui
              servicePort: 80

default-ingress.yml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: behive-backend
  annotations:
    kubernetes.io/ingress.class: traefik
    ingress.kubernetes.io/protocol: https
    traefik.ingress.kubernetes.io/redirect-entry-point: https
    traefik.ingress.kubernetes.io/redirect-permanent: "true"
spec:
  rules:
    - host: wh-entry.behive.io
      http:
        paths:
          - path: /
            backend:
              serviceName: webhook-service
              servicePort: 3000
  tls:
    - secretName: traefik-ui-tls-cert

app.yml

apiVersion: v1
kind: Service
metadata:
  name: webhook-service
  labels:
    app: behive-webhook-entry
spec:
  ports:
    - name: node-app
      port: 3000
      targetPort: 3000
  selector:
    app: behive-webhook-entry
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: webhook-deployment
  labels:
    app: behive-webhook-entry
    env: prod
spec:
  selector:
    matchLabels:
      app: behive-webhook-entry
  replicas: 1
  strategy:
    type: Recreate
  template:
    metadata:
      annotations:
        ad.datadoghq.com/nodejs.logs: '[{"source":"nodejs","service":"webhook-entry"}]'
      labels:
        app: behive-webhook-entry
        env: prod
    spec:
      containers:
        - name: webhook
          image: mutterpedro/behive-wh-entry:1.0.0
          ports:
            - name: app
              containerPort: 3000
              hostPort: 3000
          livenessProbe:
            httpGet:
              port: 3000
              path: /liveness
            initialDelaySeconds: 60
            periodSeconds: 300
          readinessProbe:
            httpGet:
              port: 3000
              path: /readiness
            initialDelaySeconds: 90
            periodSeconds: 300
          env:
            - name: KAFKA_HOST
              value: kafka-service:9092
            - name: FIREBASE_API_KEY
              valueFrom:
                secretKeyRef:
                  name: firebase
                  key: api-key
            - name: FIREBASE_DATABASE_URL
              valueFrom:
                secretKeyRef:
                  name: firebase
                  key: database-url
            - name: FIREBASE_PROJECT_ID
              valueFrom:
                secretKeyRef:
                  name: firebase
                  key: project-id
            - name: AUTH_USER
              valueFrom:
                secretKeyRef:
                  name: wh-basic-auth
                  key: user
            - name: AUTH_PASSWORD
              valueFrom:
                secretKeyRef:
                  name: wh-basic-auth
                  key: password
            - name: DD_API_KEY
              valueFrom:
                secretKeyRef:
                  name: datadog-secret
                  key: api-key
      imagePullSecrets:
        - name: regcred