Various PHP runtime errors in checkbook_advanced_search

[ecs-hk]

I've been tinkering with deployments of Checkbook NYC. I can get previous point-in-time versions (i.e. earlier Github project commits) working correctly. But the most recent commit is throwing a couple PHP errors when I attempt to navigate to main Checkbook page.

The following messages are taken from /var/log/httpd/checkbook_error.log

First, I bumped into this one:

[Mon Dec 28 05:43:00 2015] [error] [client 10.177.60.130] PHP Fatal error:  Unsupported operand types in /var/www/html/sites/all/modules/custom/checkbook_advanced_search/checkbook_advanced_search.module on line 70

After reviewing the commit history for "checkbook_advanced_search.module", I decided to comment out line 70 and see if I could progress. But then I bumped into this problem:

[Mon Dec 28 05:50:39 2015] [error] [client 10.177.60.130] PHP Fatal error:  Class 'MappingUtil' not found in /var/www/html/sites/all/modules/custom/checkbook_advanced_search/includes/checkbook_advanced_search.inc on line 172

Any suggestions? Please let me know if I can provide more information.