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    <p>There are a lot of layers to this answer depending on what you want to see and how deep down the rabbit hole you want to go.</p> <hr> <p>Let's start with the easy stuff:</p> <p>The error you are getting tells me that a call to <code>static_resource:resource_exists/2</code> resulted in a call to <code>filename:join/1</code> which failed because it was passed <code>[]</code> as its argument. That should help you track down the issue.</p> <p>Recommended reading: <a href="http://learnyousomeerlang.com/errors-and-exceptions" rel="nofollow">errors-and-exceptions</a></p> <hr> <p>A crude way to track down errors in any language is just to add print statements at strategic loctations. In this case you can use <code>io:format/2</code> or <code>erlang:display/1</code> to display whatever you want to the console. For example:</p> <pre><code>... erlang:display("I'm inside resource_exists!"), StuffToJoin = ["foo", "bar"], erlang:display(StuffToJoin), filename:join(StuffToJoin), ... </code></pre> <p>Just reload the page you should see the value printed in the console (assuming the appropriate function was called as part of the reload).</p> <hr> <p>If you want to manually test a resource (like in a unit test) you can do something like the following:</p> <pre><code>Headers = [{"Host", "mydomain.com"}, {"user-agent", "Firefox"}], Context = [], Path = "/static", ReqData = wrq:create('GET', {1,1}, Path, mochiweb_headers:from_list(Headers)), static_resource:resource_exists(ReqData, Context) </code></pre> <hr> <p>If you want a deep look at how to debug webmachine, you can read <a href="http://webmachine.basho.com/debugging.html" rel="nofollow">this</a>. You can get pretty far with the above, but doing a full trace can be helpful if you need to see the decision graph.</p>
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    1. USDavid Weldon
    1. USDavid Weldon
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    1. COI think it would help if the OP could share the whole module code, it's hard to figure out what's wrong with only fragments of functions.
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      1. USDavid Dossot
    2. COHi @david, I'm making headway. You're the best. Thanks, LRP
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      1. USLloyd R. Prentice
    3. COCool. I'm happy help. :)
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