dashman sentinel error

[europound]

sentinel installed : /root/dashman/lib/dashman_functions.sh: line 1127: [: -gt: unary operator expected
NO
sentinel tests passed : /root/dashman/lib/dashman_functions.sh: line 1128: [: -eq: unary operator expected
NO
sentinel crontab enabled : /root/dashman/lib/dashman_functions.sh: line 1129: [: -gt: unary operator expected
NO
sentinel online : /root/dashman/lib/dashman_functions.sh: line 1130: [: -eq: unary operator expected
NO - sync incomplete

ab enabled : /root/dashman/lib/dashman_functions.sh: line 1129: [: -gt: unary operator expected
NO
sentinel online : /root/dashman/lib/dashman_functions.sh: line 1130: [: -eq: unary operator expected
NO - sync incomplete
Exiting.

root@e4658ba3ec87:~/dashman# ./dashman install sentinel
dashman version 0.1.25 (36-g7a3f2f1) - Wed Nov 1 00:04:14 UTC 2017
gathering info, please wait... DONE!
--> Downloading sentinel... DONE!
--> installing dependencies...
--> virtualenv init... DONE!
--> pip modules... DONE!
--> testing installation... DONE!
--> installing crontab... DONE!
Exiting.


-g7a3f2f1) - Wed Nov 1 00:03:15 UTC 2017
gathering info, please wait... No JSON object could be decoded
DONE!