Getting 404 not found on testrail api because /testrail/ is automatically added to the url

[deepashree-dexcom]

Hello , I get following error because /testrail/ is automatically added to the url
[ ERROR ] Calling method 'end_test' of listener 'TestRailListener' failed: HTTPError: 404 Client Error: Not Found for url: https://:443/testrail/index.php?/api/v2/get_results_for_case/145/1274&limit=1

I use following command
robot -d results --listener TestRailListener:::: --loglevel debug --pythonpath -t ""

I am not using http or https in the command.

Any help is appreciated.