Unable to view admin page after installing 7.12

Turned on debug in index.php

That led to the error below. From there it was some trial and error, but basically it necessary to move several seemingly old modules out of the way such as (none of the modules moved had been customized):
mv /var/www/html/(website)/suitecrm/modules/AM_ProjectHolidays /home/(username)/tmp/.
mv /var/www/html/(website)/suitecrm/modules/CE_custom_export/ /home/(username)/tmp/.
and several others.

Only one thing I found not working now - I can’t access the Upgrade Wizard. Non-admin users are now able to log in and for admin users the the normal Admin page displays. I tried a quick repair/rebuild and that processed. But the Upgrade Wizard comes up after a while with a blank page. I was trying to upgrade from 7.12 to 7.12.1.

Here is the error:
Fatal error: Uncaught Error: Call to undefined method Basic::Basic() in /var/www/html/(website)/suitecrm/modules/AM_ProjectHolidays/AM_ProjectHolidays_sugar.php:71

Stack trace: #0 /var/www/html/(website)/suitecrm/modules/AM_ProjectHolidays/AM_ProjectHolidays.php(44): AM_ProjectHolidays_sugar->AM_ProjectHolidays_sugar()

#1 /var/www/html/(website)/suitecrm/include/MVC/SugarModule.php(113): AM_ProjectHolidays->AM_ProjectHolidays()

#2 /var/www/html/(website/suitecrm/modules/Users/User.php(2002): SugarModule->loadBean()

#3 /var/www/html/(website)/suitecrm/modules/Users/User.php(2060): User->_getModulesForACL(‘dev’)

#4 /var/www/html/(website)/suitecrm/modules/Administration/metadata/adminpaneldefs.php(443): User->getDeveloperModules()

#5 /var/www/html/(website)/suitecrm/modules/Administration/index.php(63): require(’/var/www/html/a…’)

#6 /var/www/html/(website)/suitecrm/include/MVC/View/SugarView.php(823): include_once(’/var/www/html/a…’)

#7 /var/www/html/(website)/suitecrm/incl in /var/www/html/(website/suitecrm/modules/AM_ProjectHolidays/AM_ProjectHolidays_sugar.php on line 71