Problem debugging old flash builder project in flash builder 4.7

[awadheshk29315276]

Hello

I am facing problem debugging an old flex project in new Flash builder 4.7 IDE. It show me message in confirmation box as:

<swf file path>
The SWF application file does not contain required debugging information. You might need to edit your project settings or recreate your project.
Do you want to try to debug the file anyway?

Can any one help me out.

Thanks in advance.