About "Client.Timeout exceeded while awaiting headers".... How can I fix this problem?

(venv01) C:\Flaskspace\python-hellofly-flask-main>flyctl deploy
==> Verifying app config
→ Verified app config
==> Building image
Remote builder fly-builder-morning-lake-4227 ready
==> Building image with Buildpacks
→ docker host: 20.10.12 linux x86_64
base: Pulling from paketobuildpacks/builder
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4f4fb700ef54: Downloading [==================================================>] 32B/32B
Error failed to fetch an image or build from source: failed to fetch builder image ‘Docker’: Get “https://registry-1.docker.io/v2/”: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)