@sanaa, take a close look at the code you are compiling. The code parses command line arguments and desires 2 input values, if you want to use both, being a model for the eyes and a model for the face. This means your execution should be something like something.exe --face_cascade=/path/to/frontal/face/model/on/your/system.txt --eyes_cascade=/path/to/eye/model/on/your/system.txt.
Then it should run just fine. In the future, having an idea of what to pass can be get by calling the help parameter using something.exe --help