HTTP ERROR 500 . Getting such error why trying to install bootstrap 3 theme in OJS 3.0.2
This the php log error
[02-Aug-2019 12:22:46 Europe/Berlin] PHP Fatal error: Call to undefined method BootstrapThreeThemePlugin::addMenuArea() in /Applications/XAMPP/xamppfiles/htdocs/ojs/plugins/themes/bootstrap3/BootstrapThreeThemePlugin.inc.php on line 93
[02-Aug-2019 12:22:50 Europe/Berlin] PHP Fatal error: Call to undefined method BootstrapThreeThemePlugin::addMenuArea() in /Applications/XAMPP/xamppfiles/htdocs/ojs/plugins/themes/bootstrap3/BootstrapThreeThemePlugin.inc.php on line 93
[02-Aug-2019 12:22:54 Europe/Berlin] PHP Fatal error: Call to undefined method BootstrapThreeThemePlugin::addMenuArea() in /Applications/XAMPP/xamppfiles/htdocs/ojs/plugins/themes/bootstrap3/BootstrapThreeThemePlugin.inc.php on line 93
[02-Aug-2019 12:22:46 Europe/Berlin] PHP Fatal error: Call to undefined method BootstrapThreeThemePlugin::addMenuArea() in /Applications/XAMPP/xamppfiles/htdocs/ojs/plugins/themes/bootstrap3/BootstrapThreeThemePlugin.inc.php on line 93
[02-Aug-2019 12:22:46 Europe/Berlin] PHP Fatal error: Call to undefined method BootstrapThreeThemePlugin::addMenuArea() in /Applications/XAMPP/xamppfiles/htdocs/ojs/plugins/themes/bootstrap3/BootstrapThreeThemePlugin.inc.php on line 93
[02-Aug-2019 12:22:50 Europe/Berlin] PHP Fatal error: Call to undefined method BootstrapThreeThemePlugin::addMenuArea() in /Applications/XAMPP/xamppfiles/htdocs/ojs/plugins/themes/bootstrap3/BootstrapThreeThemePlugin.inc.php on line 93
[02-Aug-2019 12:22:54 Europe/Berlin] PHP Fatal error: Call to undefined method BootstrapThreeThemePlugin::addMenuArea() in /Applications/XAMPP/xamppfiles/htdocs/ojs/plugins/themes/bootstrap3/BootstrapThreeThemePlugin.inc.php on line 93