API to Trigger a new Build by Project (preview) fails

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curl -X POST --header "Content-Type: appliation/json" -d '{"branch":":branch"}' -d 'build_parameters[CIRCLE_JOB]=build' https://circleci.com/api/v1.1/project/github/:username/:repo/tree/:branch?circle-token=:token

Configuration errors: 2 errors occurred:

* Configuration version 2.1 requires the "Enable Build Processing" project setting. Enable Build Processing under Project Settings -> Advanced Settings. In order to retrigger build processing, you must push a new commit.
* Cannot find a job named `build` to run in the `jobs:` section of your configuration file.
If you expected a workflow to run, check your config contains a top-level key called 'workflows:'
  • version: 2.1 is set.
  • “Enable Build Processing” is enabled.
  • build exists under jobs:.
  • If I give a workflow name it errors just the same. (including still talking about build job rather than the workflow name)