Finally it has worked. I beleive that map was broken. I tried with another map and worked perfectly.
This is the server parameters I have used:
## Server Parameters | https://docs.linuxgsm.com/configuration/start-parameters#additional-parameters
startparameters="-batchmode +app.listenip ${ip} +app.port ${appport} +server.ip ${ip} +server.port ${port} +server.tickrate ${tickrate} +server.hostname \"${servername}\" +server.identity \"${selfname}\" +server.gamemode ${gamemode} +levelurl "https://www.dropbox.com/s/0nkidtknykf20a7/TFCNorthAmerica.map?dl=1" +server.maxplayers ${maxplayers} +server.saveinterval ${saveinterval} +rcon.web ${rconweb} +rcon.ip ${ip} +rcon.port ${rconport} +rcon.password \"${rconpassword}\" -logfile"
I have used the following parameter [ +levelurl ] instead of [ +server.levelurl ] and included the link followed by that as you said thanks to you.
I am not sure though if this was the issue from the first place or the map. However, the map definitely has an issue.
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