This error message may occur when using the TrendMicro Anti-Virus program while the "Enable machine-learning" option is enabled. By default, this option is enabled following installation of TrendMicro Anti-Virus.
To determine if your error is related to this feature, please temporarily uncheck the "Enable machine-learning" option from within the TrendMicro Anti-Virus options.
From the Protection Settings, navigate to Scan Preferences and locate the "Enable machine-learning to protect from new or unknown threats" checkbox.
Once disabled, re-launch MapleStory 2.