It appears www/august was not removed properly from the ports system and is preventing ports-mgmt/synth from being able to do anything.
Code:
$ sudo synth status
Regenerating flavor index: this may take a while ...
Scanning entire ports tree.
progress: 87.12%
culprit: www/august
Scan aborted because 'make' encounted an error in the Makefile.
www/august (return code = 1)
Flavor index generation failed: ports scan