The solution for me was pretty simple.
I've done primary definition , and despite rebuild of my project got 73 messages of warnings in this manner:
solution Could not find schema information for the element 'loggingConfiguration'
I've remembered that I am refferencing the dll's in my Project Folder , with future thought to move my project and not to rely on microsoft installation folder of enterprise library.
All I needed to do is to put xml files , that came with the installation , into my project folder and restart Visual Studio , so it"ll see the xml - es ,
and also when the app.config is not open i don't see the warnings.