Using Flex Hero SDK with FlexBuilder 3

Trying to compile a library project requiring Flex 4.0+ (or Hero) SDK in FlexBuilder 3 should be straightforward: just point Flex to the new SDK. However, like many things Flex, this simple task yields an error:

“unable to open ‘/Applications/Adobe Flash Builder Burrito/sdks/4.5.0/frameworks/libs/player/9.0”

The key is to add a compiler argument like: “-target-player=10.1". For library projects, we have to set a compiler argument since the Flex GUI does not allow for specifying flash player versions.

Check out this post for the full directions:


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