I formatted the computer and updated java in flash builder directory also updated air sdk.
Try reverting back to the default Java JRE and see if FB compiles. There is still a problem with Java 8 and FB compiling projects.
The initial content error here I am pretty sure means no Main.swf was created(compiled) and FB cannot actually find the swf to run.
So you can see how this Java 8 issue could raise this error, nothing is being compiled because FB is dying in the background without a successful swf output.