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The BACKEND_URL env 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.

Problem:

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. This BACKEND_URL value is then passed to initThinBackend(..).

Solution:

1. Open .env in the project directory. Create an empty if the .env file doesn't exist yet.

2. Copy the env var for your Thin project into the .env file:

   Project	Env Var

3. Start npm run dev again. If you already have a npm run dev running, make sure to restart the command so that the env vars are reloaded.