Harry,
I'd start debugging here:
Failed to initialized GnuTLS: Error in public key generation
Now, without knowing more about your setup I wonder if the issue could
be related to this?:
https://issues.apache.org/jira/browse/GUACAMOLE-1921
It's been a while since I used VNC with Guacamole, and I'm not au fait
with the detail around this bug, but as it's dealt with in Guacamole
1.5.5 you might want to trial that and see if the error persists.
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