php eclipse mars update - xdebug - windows - 找不到合适的文件

I've just made an update to eclipse mars and all my project were left as they were. everything works fine except xdebug;

I am on windows7 64b; I'm making debug on remote server; I have all configs fine on server:

xdebug.remote_enable 1
xdebug.remote_host "mylocalip"
xdebug.idekey XDEBUG_ECLIPSE_DBG
xdebug.remote_autostart 0 

I've also enabled the xdebug log. From there I've found out IDE & xdebug are communicating fine:

xdebug.remote_log /var/www/html/xdebug.log

I: Connecting to configured address/port: .....:9000. 
I: Connected to client. :-)

I've tried all combinations of Path Mapping in PHP -> Debug -> Debggers -> PHP Server (because I have sources on local disk and I sync them to server on build).

Result:

No appropriate file located or no file selected. Debug Terminated

The only issue I can see is that Eclipse Mars is having an issue with xdebug configs or smth.

Solution Update:

You also get error this if you are missing project include path under your project settings: PHP Include Path > Source.