Leaderlogs are not supported any more, see the deprecation notice on the github repo here:
DEPRECATION NOTICE
These scripts will cease to be maintained immediately and may not be updated to support changes to future Cardano node and cli instances. The scripts may be removed from this repository all together on or after 2021-03-01 . No support will be provided for these scripts by Andrew Westberg, PapaCarp, or Adam Dean. As an alternative, we strongly recommend that you consider installing the fantastic CNCLI utility library by Andrew Westberg.