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No I have not seen or experienced this error. We might have to ping Cisco and see if they have insight on this.
Can you capture and upload CNC logs, as per instructions below:
1) open a command line on Ubuntu on CNC
2) cd ~/de/cnc/logs
3) tail -f ncs-java-vm.log
note: you'll need to capture log output
4) in the CNC start your normal routine until you see the error.
5) keep capturing the log while you attempt to clear all topology or add flows.
Are you using the pre-build CNC Virtual Machine or do you have the CNC installed on your own Ubuntu machine?
Is the java process running?
Also maybe not related, but which java version is your Ubuntu running? command: 'java -version'
Also since the error mentions, 'syntax error' I would double-check that everything is correct (URIs, IPs etc).
Is the 10.1.1.1 an IP of your CNC or the IE4000 switch?
Solved: It seemed to be a problem with trying to use Internet Explorer for both CNC management and cRIO file transfers at the same time, even in separate instances. Closing my file transfer via IE to the cRIO and restarting the CNC resolved the problem.