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I'm receiving the following error whenever I restart my server:
[11:35:28] [Server thread/ERROR]: Cannot load plugins\RealVillagerTowns\saves.ymlorg.bukkit.configuration.InvalidConfigurationException: could not determine a constructor for the tag tag:yaml.org,2002:org.bukkit.Material in 'string', line 1072, column 10: has: !!org.bukkit.Material 'POPPY' ^
at org.bukkit.configuration.file.YamlConfiguration.loadFromString(YamlConfiguration.java:57) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.bukkit.configuration.file.FileConfiguration.load(FileConfiguration.java:163) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.bukkit.configuration.file.FileConfiguration.load(FileConfiguration.java:131) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.bukkit.configuration.file.YamlConfiguration.loadConfiguration(YamlConfiguration.java:184) [spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at io.hotmail.com.jacob_vejvoda.RVT.RVT.<init>(RVT.java:68) [RVT.jar:?] at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_201] at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) [?:1.8.0_201] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) [?:1.8.0_201] at java.lang.reflect.Constructor.newInstance(Unknown Source) [?:1.8.0_201] at java.lang.Class.newInstance(Unknown Source) [?:1.8.0_201] at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:72) [spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:135) [spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:332) [spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:252) [spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.bukkit.craftbukkit.v1_13_R2.CraftServer.loadPlugins(CraftServer.java:325) [spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at net.minecraft.server.v1_13_R2.DedicatedServer.init(DedicatedServer.java:213) [spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:698) [spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at java.lang.Thread.run(Unknown Source) [?:1.8.0_201]Caused by: org.yaml.snakeyaml.constructor.ConstructorException: could not determine a constructor for the tag tag:yaml.org,2002:org.bukkit.Material in 'string', line 1072, column 10: has: !!org.bukkit.Material 'POPPY' ^
at org.yaml.snakeyaml.constructor.SafeConstructor$ConstructUndefined.construct(SafeConstructor.java:541) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.yaml.snakeyaml.constructor.BaseConstructor.constructObjectNoCheck(BaseConstructor.java:204) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:193) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping2ndStep(BaseConstructor.java:453) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.yaml.snakeyaml.constructor.SafeConstructor.constructMapping2ndStep(SafeConstructor.java:184) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping(BaseConstructor.java:434) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.yaml.snakeyaml.constructor.SafeConstructor$ConstructYamlMap.construct(SafeConstructor.java:521) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.bukkit.configuration.file.YamlConstructor$ConstructCustomObject.construct(YamlConstructor.java:30) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.yaml.snakeyaml.constructor.BaseConstructor.constructObjectNoCheck(BaseConstructor.java:204) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:193) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping2ndStep(BaseConstructor.java:453) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.yaml.snakeyaml.constructor.SafeConstructor.constructMapping2ndStep(SafeConstructor.java:184) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping(BaseConstructor.java:434) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.yaml.snakeyaml.constructor.SafeConstructor$ConstructYamlMap.construct(SafeConstructor.java:521) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.bukkit.configuration.file.YamlConstructor$ConstructCustomObject.construct(YamlConstructor.java:30) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.yaml.snakeyaml.constructor.BaseConstructor.constructObjectNoCheck(BaseConstructor.java:204) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:193) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping2ndStep(BaseConstructor.java:453) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.yaml.snakeyaml.constructor.SafeConstructor.constructMapping2ndStep(SafeConstructor.java:184) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping(BaseConstructor.java:434) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.yaml.snakeyaml.constructor.SafeConstructor$ConstructYamlMap.construct(SafeConstructor.java:521) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.bukkit.configuration.file.YamlConstructor$ConstructCustomObject.construct(YamlConstructor.java:30) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.yaml.snakeyaml.constructor.BaseConstructor.constructObjectNoCheck(BaseConstructor.java:204) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:193) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.yaml.snakeyaml.constructor.BaseConstructor.constructDocument(BaseConstructor.java:159) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.yaml.snakeyaml.constructor.BaseConstructor.getSingleData(BaseConstructor.java:146) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.yaml.snakeyaml.Yaml.loadFromReader(Yaml.java:524) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.yaml.snakeyaml.Yaml.load(Yaml.java:437) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] at org.bukkit.configuration.file.YamlConfiguration.loadFromString(YamlConfiguration.java:55) ~[spigot-1.13.2.jar:git-Spigot-f09662d-7c395d4] ... 17 more
My version is git-Spigot-f09662d-7c395d4 (MC: 1.13.2) (Implementing API version 1.13.2-R0.1-SNAPSHOT).
EDIT:
This seems to only occur when the player has a baby.
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