Error Compiling Movie... some past discussions and ideas
-and WMV files frame rate http://forums.adobe.com/message/4629210
What version of Premiere Elements are you using and on what computer operating system is it running?
What are the properties of your source media and what project preset are you setting to match the properties of your source media?
There is no 1080p50 5.1 project preset in any version of Premiere Elements.
Please see the following for creating your own 1080p50 5.1 project preset and exporting it as 1080p50 5.1.
Let us determine what your sources are, how you are setting up the project, and then we can look microscopically
into the Timeline content for flaw(s) that might be triggering your error message.
We will be watching for your reply.