XCode Bot Error: “internal-post-timeseries-error”

Question

I've got the new OSX Mavericks Server set up to run the tests for my iOS project through a Bot. While the build and the tests to run and everything passes just fine, the actual integration is reported as a failure. The following error appears several times towards the end of the bot's log file:

[https]Request{XCBotService.updateBot:({
    guid = "c5e4cf65-5a99-5a99-6ac7-e19d4fd9600f";
    latestFailedBotRunGUID = "46c2cc1f-2c0d-4613-901a-3285ccf7c4cf";
    latestRunStatus = failed;
    latestRunSubStatus = "internal-post-timeseries-error";
})}

Does anyone know what that means or how to resolve it?