/bin/bash: ./darknet: No such file or dir

!./darknet detector train data/obj.data cfg/custom-yolov4-detector.cfg yolov4.conv.137 -dont_show -map
/bin/bash: ./darknet: No such file or directory
I try use roboflow’s datasets (7 different datasets ) on golab with yolo 4 and darknet. Every time on step of training I faced problem /bin/bash: ./darknet: No such file or directory .
What file or directory I need ?