I am trying to upgrade from 4.1 to 4.3 but I am getting this error when I try to run the upgrade. I'm using a non-standard root (/tracker/public) and have configured the RewriteBase rule. That has worked for prior upgrades. However, something is still wrong.

An error occurred in The Bug Genie
Class '\thebuggenie\core\modules\remote\Remote' not found
An unhandled exception occurred:
/home/catsto5/public_html/tracker/core/framework/Context.php, line 1034:
Class '\thebuggenie\core\modules\remote\Remote' not found
Stack trace:

thebuggenie\core\framework\Context::loadInternalModules()
/home/catsto5/public_html/tracker/core/framework/Context.php, line 576
thebuggenie\core\framework\Context::initialize()
/home/catsto5/public_html/tracker/core/framework/Context.php, line 2564
thebuggenie\core\framework\Context::bootstrap()
/home/catsto5/public_html/tracker/public/index.php, line 28

Log messages:
info [main] 0.2 ms Installation mode enabled
info [main] 0.24 ms Upgrade mode enabled
info [core] 0.42 ms Loading configuration from cache
info [core] 0.44 ms Loading configuration from files
info [core] 0.91 ms Done Loading Configuration
info [main] 0.92 ms Initializing Caspar framework
info [main] 0.92 ms PHP_SAPI says "fpm-fcgi"
info [main] 0.93 ms We are version "4.3.0"
info [main] 0.93 ms Debug mode: yes
info [main] 0.94 ms Initializing session
info [main] 1.05 ms done (initializing session)
info [main] 1.06 ms Loading B2DB
info [main] 1.23 ms ...done (Initializing B2DB)
info [main] 1.25 ms ...done
info [main] 1.25 ms Initializing context
info [main] 1.26 ms Loading scope
info [main] 1.27 ms Setting current scope
warning [main] 1.28 ms It couldn't
info [main] 1.28 ms done (loading scope)
info [main] 1.29 ms Loading internal modules

My .htaccess file in /tracker/public/.htaccess looks like this:

Options +FollowSymlinks

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /tracker/public

RewriteCond %{REQUEST_FILENAME} -s [OR]
RewriteCond %{REQUEST_FILENAME} -l [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^.*$ - [L]

RewriteRule ^(.*)$ index.php?url=$1 [NC,QSA,L]

</IfModule>