Duck DNS Problem! Help!

Hi! I had Duck DNS working with NGINx but my system crashed and I had to create a new install.
I have installed and configured the Duck DNS addon, but when I start it I get the following error in the log -

INFO: Using main config file /data/workdir/config

ERROR: Lock file ‘/data/workdir/lock’ present, aborting.

Any help, guidance, suggestions, please?