flex viewer errors(1046, 1067,1119) in the fresh install

Hi there, I was hoping someone could help me figure out what I am missing. I am trying out my first install of flex viewer 3.3, with flex api 3.1. When I try to run my index.mxml file, I get bunch of error messages like :

1046: Type was not found or was not a compile-time constant: UniqueValueRenderer. RendererParser.as /arcgis-viewer-flex/src/com/esri/viewer/utils line 74 Flex Problem
1046: Type was not found or was not a compile-time constant: VETiledLayer. ConfigManager.as /arcgis-viewer-flex/src/com/esri/viewer/managers line 1201 Flex Problem
1119: Access of possibly undefined property exportColumnDelimiter through a reference with static type com.esri.ags.components:AttributeTable. AttributeTableWidget.mxml /arcgis-viewer-flex/src/widgets/AttributeTable line 933 Flex Problem
1120: Access of undefined property CalendarField. AttributeTableWidget.mxml /arcgis-viewer-flex/src/widgets/AttributeTable line 883 Flex Problem

etc


It sounds like I am missing some library files. Strange thing is I had the file running with flex api 3.3 but our client uses api 3.1 so I changed the flex api, but now when I revert back to flex api 3.3 I still get these errors. If you could provide me any suggestions as to how to resolve these issues, I would appreciate it a lot.

Regards,
Deewen