It turns out that the AuxTaskNonRT name was too long ?
I have seen this before, so I tried making it shorter and the error went away...
It seems to pop up a bit at random :S
I did the name change from:
std::string("OscSenderTask_") + ip_address + std::to_string(port)
to
std::string("OscSndTsk_") + ip_address + std::to_string(port)
and the problem was gone. Also fixed a missing include of <string> but I think you also did that on dev branch ?