Fly.io Deployment

Hey, I have an error during the fly deployment. Any idea ?

==> Creating build context
--> Creating build context done
==> Building image with Docker
--> docker host: 20.10.12 linux x86_64
[+] Building 44.7s (0/1)                                                                                 
[+] Building 9.1s (7/11)                                                                                 
 => [internal] load remote build context                                                            0.0s
 => copy /context /                                                                                 5.4s
 => [internal] load metadata for docker.io/library/node:16                                          0.7s
 => [1/8] FROM docker.io/library/node:16@sha256:e97b6d302062583e09be70f430b703637f6ef26c2cbb0d7bfe  0.0s
 => CACHED [2/8] RUN apt-get update && apt-get install libvips-dev -y                               0.0s
 => CACHED [3/8] WORKDIR /opt/                                                                      0.0s
 => ERROR [4/8] COPY ./package.json ./yarn.lock                                                     0.0s
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 > [4/8] COPY ./package.json ./yarn.lock:
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Error failed to fetch an image or build from source: error building: failed to compute cache key: "/package.json" not found: not found