Armory offline transaction


I am trying ty make an offline Armory transaction .
Instead of getting text to be signed I get the following Error:

Sorry, we got an error when trying to do the requested action: 'JSON-RPC Error:
Type: Server error

Code: -32000

Message: Got call_jsonrpc_api request error: result is None – is the ‘http://armory-utxsvr:6590/’ endpoint operational?

’ (API method: create_armory_utx).

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Any Idea why is this happening?