Exception running server

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1

Hello,

I have TONS of this error message in all display logs:

Exception running server: Failed to listen on prefix ‘http://localhost:9696/’ because it conflicts with an existing registration on the machine.

To be clear: on all display clients I removed client 1.79 and installed the 1.8.0, then I have registered clients on new 1.8.0 CMS

2

Is there anything else running on that port?

3

I dont’ think so, anyway I edited the port => 9697 and no more error.

4

UPDATE

I have installed client 1.8.1 over 1.8.0 without uninstall the old version… I have again the same error

Exception running server: Failed to listen on prefix ‘http://localhost:9697/’ because it conflicts with an existing registration on the machine.

I have moved to 9698 but what’s the root cause of this issue?
How can I fix it ?