IOS app crashing when using FileStream on Iphone 4s

Hi

My ios app downloading zip file which contains several mp3 files, extracting these files from zip file and writing to applicationStorageDirectory via fileStream.writeBytes method asynchronously.

app works fine on Iphone 4 (ios version 7.0.3, adobe air sdk 17.0.0.144 and 18.0.0.109 )

but same app crashed on Iphone 4s (ios version 7.0.6, adobe air sdk 17.0.0.144 and 18.0.0.109 ) when writing the mp3 files to the applicationStorageDirectory.

i reproduced the FileStream issue successfully and uploaded a sample app to google drive. You can download from here: FileStreamTest.rar - Google Drive

please inform me about the issue because i must wait you to send my app to the appstore.

thanks.