flex - Functions called in incorrect sequence, or earlier call was unsuccessful -

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in application,

i did trace statements of file

for example

if(oldfile.parent.tostring()!=file.parent.tostring())

there other file print statements , , seems encounter error stated below. error not appear every time. example ran application 20 times, encounter error once.

error: error #2037: functions called in incorrect sequence, or earlier call unsuccessful. @ error$/throwerror() @ flash.filesystem::file/resolvecomponents() @ flash.filesystem::file/get parent()

may not checking existence of file before calling it. refer link might full.


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