Compilation fails: FlexCompiler$MyProcessingItem.getFile must not return null

Hi,

I'm trying to set up a Flex project to work with IDEA 10.5. Currently when I try to compile (Make Project or Make Module) I get the following error:

Error: @NotNull method com/intellij/lang/javascript/flex/build/FlexCompiler$MyProcessingItem.getFile must not return null

This sounds a bit as if the compiler doesn't know what to compile.. any ideas what may be wrong here?

Thanks, Henning