Remove leftover format spec in error log
@@ -457,7 +457,7 @@ class BuildHandler(BaseHandler):
r = future.result()
app_log.debug("task completed: %s", r)
except Exception:
- app_log.error("task failed: %s", exc_info=True)
+ app_log.error("task failed", exc_info=True)
done = True
failed = True
# TODO: Propagate error to front-end
