title: Not able to run a Taurus performance test on an existing API
body: <p>After installing <code>Taurus</code> on Win 10 machine and creating a new file for performance testing my API:</p>
  
  <p><strong>perf-test-config.yml</strong></p>
  
  <pre><code>execution:
  - concurrency: 100
    ramp-up: 1m
    hold-for: 2m
    scenario: helloworld-api-perf-test
  
  scenarios:
    quick-test:
      requests:
      - https://helloworld-api.cfapps.io
  </code></pre>
  
  <p>I get following error in log:</p>
  
  <p><strong>Error Log:</strong></p>
  
  <pre><code>&gt; bzt perf-test-config.yml
  15:32:18 INFO: Taurus CLI Tool v1.11.0
  15:32:18 INFO: Starting with configs: ['perf-test-config.yml']
  15:32:18 INFO: Configuring...
  15:32:18 INFO: Artifacts dir: C:\Users\chandeln\MY-WORK\helloworld-api\2018-03-29_15-32-18.609453
  15:32:18 WARNING: at path 'execution.0.scenario': scenario 'helloworld-api-perf-test' is used but isn't defined
  15:32:18 INFO: Preparing...
  15:32:19 WARNING: Could not find location at path: helloworld-api-perf-test
  15:32:19 ERROR: Config Error: Scenario 'helloworld-api-perf-test' not found in scenarios: dict_keys(['quick-test'])
  15:32:19 INFO: Post-processing...
  15:32:19 INFO: Artifacts dir: C:\Users\chandeln\MY-WORK\helloworld-api\2018-03-29_15-32-18.609453
  15:32:19 WARNING: Done performing with code: 1
  </code></pre>