image pull back off error for instana-autotrace-webhook

[situnp]

while installing "instana-autotrace-webhook" via helm , it is failing with image pull back off error

Normal Pulling 31s (x3 over 72s) kubelet Pulling image "containers.instana.io/instana/release/agent/instana-autotrace-webhook@sha256:6dcea4e21c631da8e1daa271f3efd5482dd6d474a776df99524cdb5aac682852"
Warning Failed 31s (x3 over 72s) kubelet Failed to pull image "containers.instana.io/instana/release/agent/instana-autotrace-webhook@sha256:6dcea4e21c631da8e1daa271f3efd5482dd6d474a776df99524cdb5aac682852": rpc error: code = Unknown desc = Error response from daemon: Get "https://containers.instana.io/v2/instana/release/agent/instana-autotrace-webhook/manifests/sha256:6dcea4e21c631da8e1daa271f3efd5482dd6d474a776df99524cdb5aac682852": unauthorized: authentication required
Warning Failed 31s (x3 over 72s) kubelet Error: ErrImagePull
Normal BackOff 8s (x4 over 71s) kubelet Back-off pulling image "containers.instana.io/instana/release/agent/instana-autotrace-webhook@sha256:6dcea4e21c631da8e1daa271f3efd5482dd6d474a776df99524cdb5aac682852"
Warning Failed 8s (x4 over 71s) kubelet Error: ImagePullBackOff