The swc ‘/Applications/Adobe Flash Builder Burrito/sdks/4.5.0/frameworks/libs/framework.swc’ has style defaults and is in the library-path, which means dependencies will be linked in without the styles. This can cause applications, which use the output swc, to have missing skins. The swc should be put in the external-library-path.
I don’t know the answer to this. Please add an answer in the comments.
Hershel posted a solution in the comments and I’ve pasted here:
This happens when a added swc has link selection ‘merged into code’. It should be default external.
Since both the libraries have style defaults.css files, the compiler overrides the added swc’s defaults.css
Remedy : Go to build path, and select the conflicting swc, open the node, go to link type, and select edit, and then select ‘external’
save, clean build !