Node had taints that the pod didn't tolerate error when deploying to Kubernetes cluster

I am trying to deploy my microservices into Kubernetes cluster. My cluster having one master and one worker node. I created this cluster for my R&D of Kubernetes deployment. When I am trying to deploy I am getting the even error message like the following,

Events:
 Type     Reason            Age        From               Message
  ----     ------            ----       ----               -------
 Warning  FailedScheduling  <unknown>  default-scheduler  0/2 nodes are available: 2 node(s) had taints that the pod didn't tolerate

My attempt

When I am exploring about the error, I found some comments in forums for restarting the docker in the node etc. So after that I restarted Docker. But still the error is the same.

When I tried the command kubectl get nodes it showing like that both nodes are master and both are ready state.

NAME           STATUS   ROLES    AGE     VERSION
 mildevkub020   Ready    master   6d19h   v1.17.0
 mildevkub040   Ready    master   6d19h   v1.17.0

I did not found worker node here. I created one master (mildevkub020) and one worker node (mildev040) with one load balancer. And I followed the official documentation of Kubernetes from the following link,

https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/high-availability/

My question

Is this error is because of the cluster problem? Because I am not finding the cluster worker node. Only master node.

You can run below command to remove the taint from master node and then you should be able to deploy your pod on that node

kubectl taint nodes  mildevkub020 node-role.kubernetes.io/master-
kubectl taint nodes  mildevkub040 node-role.kubernetes.io/master-

Now regarding why its showing as master node check the command you ran to join the node with kubeadm. There are separate commands for master and worker node joining.

To learn more about taints, read Taints and Tolerations.