Can't view the source code for functions

Hello!

I am trying to profile a C++ application with OpenMP using Intel Vtune Profiler. According to Intel Tutorial (https://software.intel.com/en-us/download/tutorial-finding-hotspots-c-sa...) I have run Hotspots Analysis and found the most time-consuming functions. In the tutorial functions' sources are shown in the Call Stack pane (see "guide" picture). However, in my case in the Call Stack pane it is written that almost all of functions have [unknown source file], so I can't find their source (see "reality" picture).

Tell me, please what should I do to find the source of these functions?
Many thanks! :)

P.S. I have compiled this application (q.exe) using NetBeans with MinGW. I have tried to run Hotspots Analysis in both Debug and Release modes, but still have no success.