Just trying to update traefik version from 21.2.0 to 26.0.0 in our organization

When trying to update from 21.2.0 tp 26.0.0 in our chart, we are facing this error.
Error from server (BadRequest): container "test-ingress-traefik" in pod "test-ingress-controller-traefik" is waiting to start: PodInitializing.

In this case what we need to and can you guys please help us on this.

When there is a new major version, it means there is a breaking change.
They are detailed in the release page:

You can try to upgrade major version one per one with:

  1. Reading the release notes carefully and see if you need to adapt your values
  2. Look at the kubernetes events log with kubernetes describe pod ....
  3. Look at the traefik logs with kubernetes logs ...