Richard,
There's something wrong with your installation of QRecall. The error that you're getting is an internal error. It says that QRecall can't find one of its components inside the QRecall application bundle. That should never happen.
Follow these steps:
(1) Uninstall QRecall by opening the QRecall application, holding down the Shift and Option keys, and choosing the QRecall > Quit and Uninstall command.
(2) Download a fresh copy of QRecall (
http://www.qrecall.com/download/).
(3) Replace your existing QRecall with the new copy.
(4) Launch QRecall, choose QRecall > Preferences, go to the Authorization tab, and pre-authorize QRecall again.
Let me know if that solves the problem.