I just found yet another way to provoke the dreaded
An internal build error has occurred. Right-click for more information.
in Flex. I got an update of some Flash assets in a SWC, and using that SWC caused the error. I tried the usual tips found on the net to no avail. What I ended up doing was to link the SWC as an RSL.
For those who don’t know what I mean, go through the following menus:

Project Properties-> Flex Build Path -> Library Path -> the lib -> Link Type : switch from “Merged Into Code” to “Runtime Shared Library (RSL)”.

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