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Following a successful upgrade to Horizon 16.0.0. from 15.0.2 I am no longer able to create user defined labels for nodes (it doesn't matter what label/size of label I try and allocate. I receive the error message: The OpenNMS web UI has encountered an error that it does not know how to handle. I have attached screen shots and the relevant exception trace.
javax.servlet.ServletException: Exception sending node label change event