Stopping Problem

Turkish
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Merhaba Aternos Yetkilisi Ben iTargetDS Sana Sorum Olacak Serverimi Açıyorum Sonra Başlatılıyor Yazıyor ve Sonra Durduruldu Yazıyor ve Server Açılmıyor Pluginlerimde Sıkıntı Yok Ve Ben Türküm Bu Soruyu Türçe Çeviriden Çevirerek Cevaplarsanız Sevinirim
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English
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Hello Aternos Author I'm iTargetDS I will be responsible for you I am opening my server I am starting then I am writing and then I am stopped I am writing and the server is not opening My plugins are no troubles and I am a Turkum This is a question <

Things That Write in the Log
Things That Write in the Log
Things That Write in the Log

My Account: iTargetDS

Starting minecraft server version 1.8.8
20:24:57] [Server thread/WARN]: at java.lang.Thread.run(Thread.java:748)
127[20:24:57] [Server thread/ERROR]: Conversion failed, please try again later
128net.minecraft.server.v1_8_R3.NameReferencingFileConverter$FileConversionException: Could not convert file for Leonardo0013
129 at net.minecraft.server.v1_8_R3.NameReferencingFileConverter$6.a(NameReferencingFileConverter.java:383) ~[minecraft_server.jar:git-Bukkit-18fbb24]
130 at net.minecraft.server.v1_8_R3.NameReferencingFileConverter$6.onProfileLookupSucceeded(NameReferencingFileConverter.java:338) ~[minecraft_server.jar:git-Bukkit-18fbb24]
131 at net.minecraft.server.v1_8_R3.NameReferencingFileConverter.a(NameReferencingFileConverter.java:77) ~[minecraft_server.jar:git-Bukkit-18fbb24]
132 at net.minecraft.server.v1_8_R3.NameReferencingFileConverter.a(NameReferencingFileConverter.java:405) [minecraft_server.jar:git-Bukkit-18fbb24]
133 at net.minecraft.server.v1_8_R3.DedicatedServer.aR(DedicatedServer.java:549) [minecraft_server.jar:git-Bukkit-18fbb24]
134 at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:188) [minecraft_server.jar:git-Bukkit-18fbb24]
135 at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:504) [minecraft_server.jar:git-Bukkit-18fbb24]
136 at java.lang.Thread.run(Thread.java:748) [?:1.8.0_144]
137[20:24:57] [Server thread/WARN]: **** DETECTED OLD PLAYER DIRECTORY IN THE WORLD SAVE
138[20:24:57] [Server thread/WARN]: **** THIS USUALLY HAPPENS WHEN THE AUTOMATIC CONVERSION FAILED IN SOME WAY
139[20:24:57] [Server thread/WARN]: ** please restart the server and if the problem persists, remove the directory './world/players'
140[20:24:57] [Server thread/INFO]: Stopping server
141[20:24:57] [Server thread/INFO]: [Vault] Disabling Vault v1.5.6-b49
142[20:24:57] [Server thread/INFO]: [AutoSaveWorld] Disabling AutoSaveWorld v4.15
143[20:25:03] [Server thread/INFO]: [ProtocolLib] Disabling ProtocolLib v4.3.0
144[20:25:03] [Server thread/INFO]: Saving players

Thanks