yolo-tiny training problem on maixgo

Hi,I train yolo-tiny on pc ,and I covert yolo.weight to .h5,.h5 to tflite ,but there is a problem when I am coverting tflite to kmodel,i do the command :

I dont know which dataset i should use in command ,i just put some images of training data in test_photos ,and the error is also a problem ,did anyone have same problem?

it seems told you, your path name too long, please shorter the path and try again