As stated on Splunkbase by the author in the release note:
"Error faced while parsing knowledgebase API response when CVSS data is missing in the response."
Updating the TA to the latest version should resolve this issue.
solved this issue, but still have no clue why this happend from one day to the other
/opt/splunk/etc/apps/TA-QualysCloudPlatform /opt/splunk/bin/splunk cmd python ./bin/run.py -k -s [apiserver] -u [user] -p [password]
Error message indicated an issue with CVSS VECTOR
We ran into the same issue and the issue was that Qualys recently updated their API to include a new field called CVSS_VECTOR_STRING. This was conflicting with the kbpopulator.py script in the TA and backing up and editing the TA worked for us.
Two solutions to this,
1)Follow the fix in the above link
2)Upgrade to the new 1.4.0 TA which comes with the fix and was released on Jan 28th 2019.
Looks like you've addressed the issue but just wanted to share the background and the knowledge of the new version of TA