I downloaded the latest nightly build of gumbo SDK (flex_sdk_220.127.116.1151) and installed it on my flash builder 4 beta 2,
but when I run each of my project, I see these run-time errors:
Error #1014: Class spark.skins::SparkSkin could not be found.
Error #1065: Variable _cee9af537b39795a3bd1729ebe7d63f3803fa353596b9c82a79ce2891eb0f825_flash_display_Sprite is not defined.
What should I do?!
you need to Merge SDK into code (read info on download page)
Note: If you are using the Flash Builder 4 Beta 2 release with a nightly build of SDK 4 after build 13079, you will encounter a runtime error due to the sparkskins.swc being built and linked as an RSL. To workaround this issue, please make the following modification in Flash Builder: Project->Properties->Build Path->Library Path->Framework Linkage and select 'Merged into code'. This issue will be fixed in the next public drop of Flash Builder.
This should fix your problem
The problem has been solved...