Error in NT Client.vi

[William Kunkel]

I've written some vision code that will run on the driver station computer and communicate with the robot via Network Tables. Whenever I start the VI, I get this error:

Error 1 occurred at Wait on Notification in NT Client.vi->target-detection.vi

Possible reason(s):

LabVIEW: An input parameter is invalid. For example if the input is a path, the path might contain a character not allowed by the OS such as ? or @.

If I select "Continue", the program behaves as expected and communication works fine, but I'd like to know if I can stop this error from occurring. The only inputs I've given to NT Client.vi are Server IP Address (10.4.22.2), Automatic Restart (T), and Update Time (20). The error seems to be related to the "Cancel Ref" input, but I don't know what that does, and I can't find any documentation.