My guess is that
a) you have turned DEBUG on for splunkWeb?
b) The python code in SplunkWeb that, when in DEBUG, inserts the 'unit tests' link into the app navigation, has been changed somehow so that now it fails when the /testing directory is not there. I think it used to quietly fail to include the 'unit tests' link when the directory was absent. Perhaps this has regressed?
If you look at log.cfg and you are in DEBUG for SplunkWeb, switching away from DEBUG will almost certainly fix it.
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