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BACKEND_URLenv variable is not set
Full Error Message:
The BACKEND_URL env variable is not set. Open the `.env` file and set the value. You can find the value in your Thin project settings.
The Thin client needs to know to which Thin project he should connect to. In most project templates this is specified by setting an environment variable
BACKEND_URL value is then passed to
.envin the project directory. Create an empty if the
.envfile doesn't exist yet.
Copy the env var for your Thin project into the
npm run devagain. If you already have a
npm run devrunning, make sure to restart the command so that the env vars are reloaded.