to fix the first part of the error message, replace :
with
in file/core/Log.php
Keep in mind this is just a temporary fix
// set the log writers $logWriters = $logConfig[self::LOG_WRITERS_CONFIG_OPTION];
with
// set the log writers $logConfig['log_writers'] = array('screen'); $logWriters = $logConfig[self::LOG_WRITERS_CONFIG_OPTION];
in file/core/Log.php
Keep in mind this is just a temporary fix