ERROR: Cannot locate specified Dockerfile: Dockerfile

[firegbn]

Buen dia, Cuando correo ./start me aparece que no a encontrado el Docker file

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.env file exists...ok [+] Good. ./external/certs/thethe.crt exists. [+] Good. ./external/certs/thethe.key exists. Building celery ERROR: Cannot locate specified Dockerfile: Dockerfile

Gracias