dropbox plugin error

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<b>Fatal error</b>:  Uncaught exception 'DropboxException' with message '%' in /var/www/ion/labs/tvabierta/wp-content/plugins/dropbox-plugin/dropbox.php:501
Stack trace:
#0 /var/www/ion/labs/tvabierta/wp-content/plugins/dropbox-plugin/dropbox.php(931): Dropbox-&gt;doCall('1/files/dropbox...', NULL, 'GET', NULL, false, true)
#1 /var/www/ion/labs/tvabierta/wp-content/plugins/dropbox-plugin/tdp_main.php(132): Dropbox-&gt;filesGet('/TELEVISA_MARKE...', false)
#2 [internal function]: tdp_elephant_sandwitch('')
#3 /var/www/ion/labs/tvabierta/wp-includes/plugin.php(403): call_user_func_array('tdp_elephant_sa...', Array)
#4 /var/www/ion/labs/tvabierta/wp-settings.php(302): do_action('init')
#5 /var/www/ion/labs/tvabierta/wp-config.php(97): require_once('/var/www/ion/la...')
#6 /var/www/ion/labs/tvabierta/wp-load.php(29): require_once('/var/www/ion/la...')
#7 /var/www/ion/labs/tvabierta/wp-blog-header.php(12): require_once('/var/www/ion/la...')
#8 /var/www/ion/labs/tvabierta/index.php(17): require('/var/www/ion/la...')
#9 {main}
  thrown in <b>/var/www/ion/labs/tvabierta/wp-content/plugins/dropbox-plugin/dropbox.php</b> on line <b>501</b><br />