Fail to websocket dial on fly launch

I’ve been trying to launch and deploy an app for a couple days now and I’m always getting this error:

==> Building image
WARN Failed to start remote builder heartbeat: failed building options: websocket: failed to WebSocket dial: expected handshake response status code 101 but got 502

After this my terminal get stuck trying to run this:

==> Building image
✓ compatible remote builder found
INFO Override builder host with:

Waiting for remote builder fly-builder-black-firefly-2509…

After a while i get this erros:

WARN Failed to start remote builder heartbeat: remote builder app unavailable

Error: failed to fetch an image or build from source: remote builder app unavailable

I tried to delete the app, re-authenticate and also tried a different build pack (from Docker to python), what else can I do?

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