If you are seeing the same error at the same line in the code then I don't see how you can be using the latest nightly build of v3.1. The logic I added to detect and report null loggers displaced the line of code where this NPE would be occurring. Line 149 in the updated code no longer matches up with the methods in your latest stack trace.
Can you please double-check that you are using the latest nightly build? It's important that when you use the appclient command that the script you run is the one from the 3.1 directory, not the 3.0 directory.
- Tim
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