An error, "failed to solve with frontend dockerfile.v0"

I was trying to build my Docker image for my Gatsby application. Whenever I run the command docker build . -t gatsbyapp, it gives me an error:

failed to solve with frontend dockerfile.v0: failed to build LLB:
failed to compute cache key: "/.env" not found: not found

Meanwhile my Dockerfile is shown below:

FROM node:13

WORKDIR /app

COPY package.json .

RUN yarn global add gatsby-cli

RUN yarn install

COPY gatsby-config.js .

COPY .env .

EXPOSE 8000

CMD ["gatsby","develop","-H","0.0.0.0"]

I had experienced this issue after upgrading to the latest Docker Desktop version on Mac. Solved with the comment on this issue.

Solution: Don't use buildkit and it works for me.

export DOCKER_BUILDKIT=0
export COMPOSE_DOCKER_CLI_BUILD=0

I had the same issue and all I had to do was to capitalize the Docker configuration filename:

dockerfile > didn't work

Dockerfile > did work

Probably not the problem the OP had, but I had this issue while trying to build my container running inside Windows Subsystem for Linux (WSL) (Debian WSL2), just after having freshly installed Docker Compose and all I had to do was close the (Debian) terminal and reopen it and my issue was solved.