The Flex offers various levels of debugging and logging to track down the issue. They are:
● Trace() method and tracetargets configuration handled in the client side for the use of the debug version of flash player or AIR runtime.
● The Compiler logs with the various warning and error points that are being reported can serve as a good tool for seeing potentially fatal data accesses etc.
● The Web Tier logging that is based on the Flex add-on for the IIS and Apache is suitable for debugging the web deployment of Flex applications.