My server does not work plz help

[hardstone]

When i start the  server  it can not load 

 

[09:57:36 INFO]: Server permissions file permissions.yml is empty, ignoring it

[09:57:36 WARN]: **** SERVER IS RUNNING IN OFFLINE/INSECURE MODE!

[09:57:36 WARN]: The server will make no attempt to authenticate usernames. Beware.

[09:57:36 WARN]: Whilst this makes it possible to use BungeeCord, unless access to your server is properly restricted, it also opens up the ability for hackers to connect with any username they choose.

[09:57:36 WARN]: Please see http://www.spigotmc.org/wiki/firewall-guide/ for further information.

[09:57:36 WARN]: To change this, set "online-mode" to "true" in the server.properties file.

[09:57:36 INFO]: Preparing level "world"

[09:57:41 INFO]: [ViaVersion] Loading block connection mappings ...

[09:57:45 ERROR]: WorldGenSettings: No key seed in MapLike[{biome_source:{preset:"minecraft:nether",type:"minecraft:multi_noise"},settings:"minecraft:nether",type:"minecraft:noise"}]; No key seed in MapLike[{biome_source:{preset:"minecraft:overworld",type:"minecraft:multi_noise"},settings:"minecraft:overworld",type:"minecraft:noise"}]; No key seed in MapLike[{biome_source:{type:"minecraft:the_end"},settings:"minecraft:end",type:"minecraft:noise"}]; No key seed in MapLike[{type:"minecraft:the_end"}] missed input: {"minecraft:overworld":{generator:{biome_source:{preset:"minecraft:overworld",type:"minecraft:multi_noise"},settings:"minecraft:overworld",type:"minecraft:noise"},type:"minecraft:overworld"},"minecraft:the_end":{generator:{biome_source:{type:"minecraft:the_end"},settings:"minecraft:end",type:"minecraft:noise"},type:"minecraft:the_end"},"minecraft:the_nether":{generator:{biome_source:{preset:"minecraft:nether",type:"minecraft:multi_noise"},settings:"minecraft:nether",type:"minec

[09:57:46 ERROR]: WorldGenSettings: No key seed in MapLike[{biome_source:{preset:"minecraft:nether",type:"minecraft:multi_noise"},settings:"minecraft:nether",type:"minecraft:noise"}]; No key seed in MapLike[{biome_source:{preset:"minecraft:overworld",type:"minecraft:multi_noise"},settings:"minecraft:overworld",type:"minecraft:noise"}]; No key seed in MapLike[{biome_source:{type:"minecraft:the_end"},settings:"minecraft:end",type:"minecraft:noise"}]; No key seed in MapLike[{type:"minecraft:the_end"}] missed input: {"minecraft:overworld":{generator:{biome_source:{preset:"minecraft:overworld",type:"minecraft:multi_noise"},settings:"minecraft:overworld",type:"minecraft:noise"},type:"minecraft:overworld"},"minecraft:the_end":{generator:{biome_source:{type:"minecraft:the_end"},settings:"minecraft:end",type:"minecraft:noise"},type:"minecraft:the_end"},"minecraft:the_nether":{generator:{biome_source:{preset:"minecraft:nether",type:"minecraft:multi_noise"},settings:"minecraft:nether",type:"minec

[09:57:46 INFO]: -------- World Settings For [world] --------

[09:57:46 INFO]: Max TNT Explosions: 100

[09:57:46 INFO]: Tile Max Tick Time: 50ms Entity max Tick Time: 50ms

[09:57:46 INFO]: Experience Merge Radius: 3.0

[09:57:46 INFO]: Entity Activation Range: An 32 / Mo 32 / Ra 48 / Mi 16 / Tiv true / Isa false

[09:57:46 INFO]: Entity Tracking Range: Pl 48 / An 48 / Mo 48 / Mi 32 / Other 64

[09:57:46 INFO]: Hopper Transfer: 8 Hopper Check: 1 Hopper Amount: 1

[09:57:46 INFO]: Custom Map Seeds:  Village: 10387312 Desert: 14357617 Igloo: 14357618 Jungle: 14357619 Swamp: 14357620 Monument: 10387313 Ocean: 14357621 Shipwreck: 165745295 End City: 10387313 Slime: 987234911 Nether: 30084232 Mansion: 10387319 Fossil: 14357921 Portal: 34222645

server error.txt

[_Tarna_]

Looks like you downgraded your server version. You can't do that without either resetting the world or using a backup. You can also just go back to whatever version it was on before to fix it.

Also in the future, please use a website like pastebin.com to send server logs to others.