I have the same error.
The wierd is that the log file doesn't exists.
Anyway I try everything... to reinstal my Flash Builder, reinstall all versions of java. I even try to make Xmx and Xms bigger size.. but nothing... still got the error.
If I create new project... then everything works fine... Export Release Build work very well,
but if I try to Export Release Build for my large project... then this error comes up.
I look at my code and no find any errors...
Build for android works as well, the error comes up when I try to build for iOS.
Please Adobe - give us help how to fix this.