Hello everyone,

I have the following issue:

I made this server with my computer to play only with a friend. Today we couldn't connect to the server.

I launched it as usual with a run.bat because I allocated 3 GB of RAM to it:

C:\Users\myname\Desktop\server_folder_name>java -Xmx3072M -Xms3072M -jar server.jar nogui
[14:58:47] [main/INFO]: Environment: authHost='https://authserver.mojang.com', accountsHost='https://api.mojang.com', sessionHost='https://sessionserver.mojang.com', servicesHost='https://api.minecraftservices.com', name='PROD'
[14:58:48] [main/WARN]: Ambiguity between arguments [teleport, destination] and [teleport, targets] with inputs: [Player, 0123, @e, dd12be42-52a9-4a91-a8a1-11c01849e498]
[14:58:48] [main/WARN]: Ambiguity between arguments [teleport, location] and [teleport, destination] with inputs: [0.1 -0.5 .9, 0 0 0]
[14:58:48] [main/WARN]: Ambiguity between arguments [teleport, location] and [teleport, targets] with inputs: [0.1 -0.5 .9, 0 0 0]
[14:58:48] [main/WARN]: Ambiguity between arguments [teleport, targets] and [teleport, destination] with inputs: [Player, 0123, dd12be42-52a9-4a91-a8a1-11c01849e498]
[14:58:48] [main/WARN]: Ambiguity between arguments [teleport, targets, location] and [teleport, targets, destination] with inputs: [0.1 -0.5 .9, 0 0 0]
[14:58:48] [main/INFO]: Reloading ResourceManager: Default
[14:58:48] [Worker-Main-8/INFO]: Loaded 7 recipes
[14:58:48] [Worker-Main-8/INFO]: Loaded 927 advancements
[14:58:50] [Server thread/INFO]: Starting minecraft server version 1.16.4
[14:58:50] [Server thread/INFO]: Loading properties
[14:58:50] [Server thread/INFO]: Default game type: SURVIVAL
[14:58:50] [Server thread/INFO]: Generating keypair
[14:58:50] [Server thread/INFO]: Starting Minecraft server on (it is the right IP, I double checked)
[14:58:50] [Server thread/INFO]: Using default channel type
[14:58:51] [Server thread/INFO]: Preparing level "world"
[14:58:51] [Server thread/INFO]: Preparing start region for dimension minecraft:overworld
[14:58:52] [Server thread/INFO]: Preparing spawn area: 0%
[14:58:52] [Server thread/INFO]: Preparing spawn area: 0%
[14:58:52] [Server thread/INFO]: Preparing spawn area: 0%
[14:58:53] [Server thread/INFO]: Preparing spawn area: 0%
[14:58:53] [Server thread/INFO]: Time elapsed: 2222 ms
[14:58:53] [Server thread/INFO]: Done (2.307s)! For help, type "help"

The 2 obvious problems I see are the warnings at the beginning and the spawn area not loading.

Do you know how I can solve this? Is it maybe a known issue? 

Thank you everyone in advance!