[20:27:35] [Server thread/INFO]: Preparing level "world"
[20:27:35] [Server thread/WARN]: java.io.FileNotFoundException: ./world/session.lock (Keine Berechtigung)
[20:27:35] [Server thread/WARN]:        at java.io.FileOutputStream.open0(Native Method)
[20:27:35] [Server thread/WARN]:        at java.io.FileOutputStream.open(FileOutputStream.java:270)
[20:27:35] [Server thread/WARN]:        at java.io.FileOutputStream.<init>(FileOutputStream.java:213)
[20:27:35] [Server thread/WARN]:        at java.io.FileOutputStream.<init>(FileOutputStream.java:162)
[20:27:35] [Server thread/WARN]:        at net.minecraft.server.v1_14_R1.WorldNBTStorage.h(WorldNBTStorage.java:83)
[20:27:35] [Server thread/WARN]:        at net.minecraft.server.v1_14_R1.WorldNBTStorage.<init>(WorldNBTStorage.java:45)
[20:27:35] [Server thread/WARN]:        at net.minecraft.server.v1_14_R1.MinecraftServer.a(MinecraftServer.java:369)
[20:27:35] [Server thread/WARN]:        at net.minecraft.server.v1_14_R1.DedicatedServer.init(DedicatedServer.java:258)
[20:27:35] [Server thread/WARN]:        at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:776)
[20:27:35] [Server thread/WARN]:        at java.lang.Thread.run(Thread.java:748)
[20:27:35] [Server thread/ERROR]: Encountered an unexpected exception
java.lang.RuntimeException: Failed to check session lock for world located at ./world, aborting. Stop the server and delete the session.lock in this world to prevent further issues.
        at net.minecraft.server.v1_14_R1.WorldNBTStorage.h(WorldNBTStorage.java:93) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at net.minecraft.server.v1_14_R1.WorldNBTStorage.<init>(WorldNBTStorage.java:45) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at net.minecraft.server.v1_14_R1.MinecraftServer.a(MinecraftServer.java:369) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at net.minecraft.server.v1_14_R1.DedicatedServer.init(DedicatedServer.java:258) ~[spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:776) [spigot-1.14.4.jar:git-Spigot-9de398a-9c887d4]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_222]
[20:27:35] [Server thread/ERROR]: This crash report has been saved to: /home/minecraft/./crash-reports/crash-2019-09-21_20.27.35-server.txt