What i do wrong

Question

First opencv project,and return this error :

error: OpenCV(3.4.2) /tmp/build/80754af9/opencv-suite_1535558553474/work/modules/objdetect/src/cascadedetect.cpp:1698: error: (-215:Assertion failed) !empty() in function 'detectMultiScale'

Answer 1

use a direct directory to the cascade. Instead of cascade.xml use c:\path\to\the\cascade.xml

Answer 2

Yea i made the absolute one to the xml files,is it compitability or some