@aaronpk got an opaque error (500) when trying to micropub authenticate on kylewm.com.
2014-06-28 21:55:10,987 - redwind - WARNING - could not get access token <Response [500]>: <html><head><title>Slim Application Error</title><sty
le>body{margin:0;padding:30px;font:12px/1.5 Helvetica,Arial,Verdana,sans-serif;}h1{margin:0;font-size:48px;font-weight:normal;line-height:48px;}
strong{display:inline-block;width:65px;}</style></head><body><h1>Slim Application Error</h1><p>The application could not run because of the foll
owing error:</p><h2>Details</h2><div><strong>Type:</strong> ErrorException</div><div><strong>Code:</strong> 8</div><div><strong>Message:</strong
> Undefined index: state</div><div><strong>File:</strong> /web/sites/tokens.indieauth.com/controllers/controller.php</div><div><strong>Line:</st
rong> 43</div><h2>Trace</h2><pre><div>#0 /web/sites/tokens.indieauth.com/controllers/controller.php(43): Slim\Slim::handleErrors(8, 'Undefined i
ndex...', '/web/sites/toke...', 43, Array)
@aaronpk got an opaque error (500) when trying to micropub authenticate on kylewm.com.