Can you open your Project Properties --> Flex Applications and make the main mxml file as default runnable application file?
I hope this works.
I would have done that for sure, if Flex Library Project allowed me to create MXML application. Did you notice its Library Project? For creating components and shipping them as swc files.
Frrrrr!!! It's irritating...
Did no one face this problem?
though I could not understand the logic just go to projects->clean.
Can you do a clean of that project.
I think that will work.
Mate the first thing I tried was this...
If you want to see the problem, try crating a Flex Library Project in Flex Builder 3. Create couple of classes and close Flex Builder without closing the project. Re-launch Flex Builder and try to open Project -> Properties -> Flex Build Path or Project -> Properties -> Flex Compiler. You should be able to see the problem.
I wasn't able to reproduce this following those steps. Perhaps you need some more specific instructions to reproduce the error, or there is something specific to your development environment causing an issue?
Okay, to make it further clear, I externalized all the libraries from Project -> Properties -> Flex Build Path -> Library Path. Since I am developing some components which will be used within Flex Builder, I don't need to merge default flex libraries (such as framework.swc) into my project. I selected Link Type as external for all the libraries. You will be able to reproduce the issue by doing this step.
Ahh yes, now I see it. "The currently displayed page contains invalid values." when you try to view the properties. Have you tried searching the Flex JIRA site for related tickets?