image docker.io/kubeedge/kubeedge-pi-counter:v1.0.0 can't been pulled.

[root@VM-0-100-centos kubeedge]# ctr image pull docker.io/kubeedge/kubeedge-pi-counter:v1.0.0
docker.io/kubeedge/kubeedge-pi-counter:v1.0.0: resolving |--------------------------------------|
elapsed: 5.6 s total: 0.0 B (0.0 B/s)
INFO[0005] trying next host error="pull access denied, repository does not exist or may require authorization: server message: insufficient_scope: authorization failed" host=registry-1.docker.io
ctr: failed to resolve reference "docker.io/kubeedge/kubeedge-pi-counter:v1.0.0": pull access denied, repository does not exist or may require authorization: server message: insufficient_scope: authorization failed

Start by searching the examples repository for the kubeedge-pi-counter:v1.0.0 image reference, then reproduce the failure with the reported ctr image pull command. Verify whether the referenced image exists at docker.io and determine the repository's expected replacement or publishing path. Done means the example's image can be pulled successfully.

Written by the indexing model from the issue text.