Here is the full error:
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at spark.components::Application/softKeyboardDeactivateHandler()[E:\dev\hero_private\framewo rks\projects\spark\src\spark\components\Application.as:1631]
It then takes me to the Application.xml class file. I have no idea what's wrong but it seems to only happen during debug mode. The only results I got on google where in Chinese. Anyone know what's wrong?