Error

12:49:06 [ERROR] Throwing
java.lang.RuntimeException: unacceptable character '' (0x15) special characters are not allowed
in "'string'", position 5096
        at cn.nukkit.plugin.PluginManager.enablePlugin(PluginManager.java:443) [nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.Server.enablePlugin(Server.java:733) [nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.Server.enablePlugins(Server.java:722) [nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.Server.<init>(Server.java:558) [nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.Nukkit.main(Nukkit.java:101) [nukkit-1.0-SNAPSHOT.jar:?]
Caused by: org.yaml.snakeyaml.reader.ReaderException: special characters are not allowed
        at org.yaml.snakeyaml.reader.StreamReader.checkPrintable(StreamReader.java:67) ~[nukkit-1.0-SNAPSHOT.jar:?]
        at org.yaml.snakeyaml.reader.StreamReader.<init>(StreamReader.java:47) ~[nukkit-1.0-SNAPSHOT.jar:?]
        at org.yaml.snakeyaml.Yaml.loadAs(Yaml.java:427) ~[nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.utils.Config.parseContent(Config.java:551) ~[nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.utils.Config.load(Config.java:160) ~[nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.utils.Config.<init>(Config.java:98) ~[nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.utils.Config.<init>(Config.java:85) ~[nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.utils.Config.<init>(Config.java:81) ~[nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.plugin.PluginBase.reloadConfig(PluginBase.java:239) ~[nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.plugin.PluginBase.getConfig(PluginBase.java:218) ~[nukkit-1.0-SNAPSHOT.jar:?]
        at de.blu.skywars.SkyWars.loadChestItems(SkyWars.java:265) ~[?:?]
        at de.blu.skywars.SkyWars.onEnable(SkyWars.java:113) ~[?:?]
        at cn.nukkit.plugin.PluginBase.setEnabled(PluginBase.java:89) ~[nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.plugin.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:117) ~[nukkit-1.0-SNAPSHOT.jar:?]
        at cn.nukkit.plugin.PluginManager.enablePlugin(PluginManager.java:439) ~[nukkit-1.0-SNAPSHOT.jar:?]
        ... 4 more