Loadrunner Error(29997): Cannot kill process or thread with moniker "1".

I am using Windows 10 and Loadrunner 12.53. I was able to run some tests 2 weeks ago on Windows 10, and I never received this message. Late last week I upgraded to Patch 4 for Loadrunner and the Load generators, and now I am receiving this error. It occurs at the start of each test, and shows up 6 times, once for each Load generator. I do not believe it is causing any issues, but I have looked online and see no trace of thsi error.

Each Load generator is running Windows 10 and is using Patch 4 as well. I am running Oracle NCA and Web/HTTP protocols.

Any help would be appreciated.