"Definition mx.utils:Base64Encoder could not be found" in Flex Builder 3

I'm trying to edit an existing AS3 application (which was built using开发者_运维百科 Flash Develop) in Flex Builder 3.

The application uses Base64Encoder (using "import mx.utils.Base64Encoder"). This compiles without problems in Flash Develop but trying to build it in Flex Builder 3 (Mac version) gives an error:

"Definition mx.utils:Base64Encoder could not be found"

Indeed when using code completion (ctrl + space) in flex, on "import mx.utils." only 4 utils are shown in the list.

I've tried this using the Flex 3.2.0 sdk that came with Flex Builder 3 and the Flex 3.5.0 sdk which I downloaded from the adobe website.

Does anyone know why this might be? and how I could resolve this?

Thanks.

I've fixed this by adding 'framework.swc' to my library build path.

Instructions:

1. Right-click project and select 'properties'

2. Select Actionscript Build Path

3. Select 'Library Path' tab

4. Click 'Add SWC...' button

5. Enter [path to your sdk]/frameworks/libs/framework.swc

6. Click 'OK' to add swc

7. Click 'OK' to close properties

8. Re-build your project

You need to include [SDK]/frameworks/libs/rpc.swc file from Flex SDK

It's probably borrowed from the Flash class lib rather than the Flex one. There are plenty of base64 implementations out there that you could substitute.