title: Error: Invalid value for '[FILES]...': Path '{path/to/data}' does not exist
body: <p>I've just gotten started with Datasette and found that while I have hundreds of .sqlite databases, only one was able to load (it was empty). Every other one has had this sort of error:</p>
  <p><code>Error: Invalid value for '[FILES]...': Path '/Users/mercury/Pictures/Photos' does not exist.</code></p>
  <p>Any suggestions?</p>