Running my batch file within the server folder server_startup.bat and manually typing the command. I also verified that my port and server settings were correct and to no luck.

I receive an error message on both 1.17 and the Pre-release even though it was claimed fixed according to a recent bug ticket, MC-227821. Even though the issue was not correctly identified through the original issue in MC-228064 being that the error messages are different as the function / method abr.o() was not able to be invoked. 

The terminal output through my batch file is as followed.

C:\Users\Owner\Desktop\Server>java -Xmx4800m -Xms4800m -jar server.jar nogui
[12:59:07] [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'
[12:59:08] [main/WARN]: Unable to create a jar-filesystem for: jar:file:/C:/Users/Owner/Desktop/Server/server.jar!/assets/.mcassetsroot: java.nio.file.FileSystemNotFoundException
[12:59:08] [main/WARN]: Ambiguity between arguments [teleport, location] and [teleport, destination] with inputs: [0.1 -0.5 .9, 0 0 0]
[12:59:08] [main/WARN]: Ambiguity between arguments [teleport, location] and [teleport, targets] with inputs: [0.1 -0.5 .9, 0 0 0]
[12:59:08] [main/WARN]: Ambiguity between arguments [teleport, destination] and [teleport, targets] with inputs: [Player, 0123, @e, dd12be42-52a9-4a91-a8a1-11c01849e498]
[12:59:08] [main/WARN]: Ambiguity between arguments [teleport, targets] and [teleport, destination] with inputs: [Player, 0123, dd12be42-52a9-4a91-a8a1-11c01849e498]
[12:59:08] [main/WARN]: Ambiguity between arguments [teleport, targets, location] and [teleport, targets, destination] with inputs: [0.1 -0.5 .9, 0 0 0]
[12:59:08] [main/INFO]: Reloading ResourceManager: Default
[12:59:08] [Worker-Main-10/INFO]: Loaded 7 recipes
[12:59:09] [Worker-Main-10/INFO]: Loaded 1137 advancements
[12:59:09] [Server thread/INFO]: Starting Minecraft server on 127.0.0.1:25565lease 1
+[12:59:16] [Server thread/INFO]: Using default channel type
[12:59:16] [Server thread/WARN]: **** FAILED TO BIND TO PORT!
[12:59:16] [Server thread/WARN]: The exception was: java.net.BindException: Cannot assign requested address: bind
[12:59:16] [Server thread/WARN]: Perhaps a server is already running on that port?
[12:59:16] [Server thread/INFO]: Stopping server
[12:59:16] [Server thread/INFO]: Saving worlds
[12:59:16] [Server thread/ERROR]: Exception stopping the server
java.lang.NullPointerException: Cannot invoke "abr.o_()" because "Γÿâ" is null
at net.minecraft.server.MinecraftServer.a(SourceFile:592) ~[server.jar:?]
at net.minecraft.server.MinecraftServer.u(SourceFile:619) ~[server.jar:?]
at aas.u(SourceFile:585) ~[server.jar:?]
at net.minecraft.server.MinecraftServer.x(SourceFile:729) ~[server.jar:?]
at net.minecraft.server.MinecraftServer.a(SourceFile:274) ~[server.jar:?]
at java.lang.Thread.run(Thread.java:831) [?:?]

C:\Users\Owner\Desktop\Server>cmd /k