RPC port parameter blocks server startup

[iFriendGit]

Dear community, if I have this in my linux service file:

--jsonrpcport 22100
--jsonrpcsecretfile /home/ubuntu/Jamulus_RPC_secret.txt \

the server does not start:
jamulus-headless.service - Jamulus-Public-Server
Loaded: loaded (/etc/systemd/system/jamulus-headless.service; enabled; vendor preset: enabled)
Active: activating (auto-restart) (Result: exit-code) since Tue 2024-03-19 08:58:44 UTC; 955ms ago
Process: 4523 ExecStart=/bin/sh -c exec /usr/bin/jamulus-headless -s -n ... --jsonrpcport 22100 --jsonrpcsecretfile /home/ubuntu/Jamulus_RPC_secret.txt (code=exited, status=1/FAILURE)

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If I have this only though, it starts
--jsonrpcsecretfile /home/ubuntu/Jamulus_RPC_secret.txt \

Please, do you have any idea?

[iFriendGit]

solved, problem was not readable secret file. Was misled by problem appearing after adding the port nr