[Errno 2] No such file or directory: 'data/tasks/.json

I run this command ./scripts/train_tk_instruct.sh
and OSError: Cannot find data file. 
Original error:
[Errno 2] No such file or directory: 'data/tasks/.json'
Downloading and preparing dataset natural_instructions/default to ./cache/natural_instructions/default-e8e348fe903ab36e/2.0.0/6aaf834f8edcbb685eabac7ce3c7af68bc248c248cea3277a382991604117fc5..