Errors when installing AjaXplorer

I am trying to install AjaXplorer but running in to problems. The first run test asks me to set my locale to `UTF-8` but I am not sure how to do this. If I skip the warning I get the following error and wondered if it has something to do with it. Exception thrown within the exception handler! Message was: Cannot find plugin text for type log in C:\UniServer\www\domain\secure\core\classes\class.ConfService.php on line 164 #0 C:\UniServer\www\domain\secure\core\classes\class.ConfService.php(184): ConfService->initUniquePluginImplInst('LOG_DRIVER', 'log') #1 C:\UniServer\www\domain\secure\core\classes\class.ConfService.php(229): ConfService->getUniquePluginImplInst('LOG_DRIVER', 'log') #2 C:\UniServer\www\domain\secure\core\classes\class.AJXP_Logger.php(89): ConfService::getLogDriverImpl() #3 C:\UniServer\www\domain\secure\core\classes\class.AJXP_Logger.php(69): AJXP_Logger::getInstance() #4 C:\UniServer\www\domain\secure\core\classes\class.AJXP_XMLWriter.php(195): AJXP_Logger::logAction('error', Array) #5 C:\UniServer\www\domain\secure\core\classes\class.AJXP_XMLWriter.php(208): AJXP_XMLWriter::catchError(0, 'Cannot find plu...', 'C:\UniServer\ww...', 164, NULL) #6 [internal function]: AJXP_XMLWriter::catchException(Object(Exception)) #7 {main}