Flash Builder 4.7 - Web project issue- A file found in a source-path must have an externally visible definition. If a definition in the file is meant to be externally visible, please put the definition in a package

Hello All,

I am getting following issue on Flash Builder 4.7 - Web application project issue- A file found in a source-path must have an externally visible definition. If a definition in the file is meant to be externally visible, please put the definition in a package in main mxml file(Application file).

Also,i am struck long time,

Can you please help me short out this issue.

Thank in advance.

Below my project structure screen short,