Error building project

[MjBordalo]

Hello i was unable to build the projcect when doing make.

The error was the following:

[ 61%] Building CXX object CMakeFiles/simple_vehicle_counting.dir/package_tracking/cvblob/cvlabel.cpp.o
In file included from /home/pi/CV/simple_vehicle_counting/package_tracking/cvblob/cvlabel.cpp:30:0:
/home/pi/CV/simple_vehicle_counting/package_tracking/cvblob/cvblob.h:433:4: warning: extra ‘;’ [-Wpedantic]
   };
    ^
/home/pi/CV/simple_vehicle_counting/package_tracking/cvblob/cvlabel.cpp:38:3: error: narrowing conversion of ‘-1’ from ‘int’ to ‘char’ inside { } [-Wnarrowing]
   };
   ^
/home/pi/CV/simple_vehicle_counting/package_tracking/cvblob/cvlabel.cpp:38:3: error: narrowing conversion of ‘-1’ from ‘int’ to ‘char’ inside { } [-Wnarrowing

[Kartik2107]

change the following in the file "simple_vehicle_counting/package_tracking/cvblob/cvlabel.cpp":
"const char" to "const signed char"
in both the lines 34 and 40.

do "make" again in "simple_vehicle_counting/build/". It worked for me.