have you looked to see if es_US locale is a supported locale?
have a look in FLEX_SDK_HOME/frameworks/locale
if its not there you may need to look at copylocale tool contained in FLEX_SDK_HOME/bin
Yes, I generated on using copy locale. Should I do anything after running copy locale, so that eclipse knows that the locale setting is now available?
you might have to restart eclipse but you shouldn't have too.
I'd check that Eclipse is actually looking at the sdk you think it is (Eclispe might be pointing to a different sdk than FlashBuilder 3)
otherwise I am out of ideas
do you have the error message?
No, I dont have any error message. Eclipse points to the same SDK that I get when i select configure SDK in project properties right?
I have never used eclispe for flex development but yes it sounds like you are configuring the sdk ok.
It fails to build but gives no error, very odd
You are correct, I generated locale files for es_US in all Flex SDKs available in the PC and that fixed this issue. For some strange reason eclipse is using an SDK that is not the same as the one configured in the project settings. Thanks a lot for the quick response.