Fatal Error on Re-Activation

SO close… If everything worked, it would be great. But…. This plugin seemes to lack core functionality. For instance, I found no way to view booked appointments. I then deactivated an re-activated the plugin and the plugins page then gave the following error: Plugin could not be activated because it triggered a fatal error . Yet the plugin seems to have loaded any way. Still missing key functions. Here is a list of the major issues: Install includes sample services without asking. No ability to view booked appointments anywhere except the WooCommerce Orders page. . (Booked slots are shown as booked when you try to book a new one though.) No email customizations No “Integrated Calendar System:”to be found anywhere. The only shortcode I could find is to display the booking form of each available service. “Enable Staff” selectable but does nothing. PDF invoices and ticketing missing Export to CVS missing. Re-activation after deactivation of plugin throws an error.(See above) This seems like a great start but incomplete.