silks errroe

[WARNING] Could not load plugin from file plugins/PropHuntSigns.jar
Can't construct a java object for tag:yaml.org,2002:net.md_5.bungee.api.plugin.PluginDescription; exception=Cannot create property=website for JavaBean=PluginDescription(name=PropHuntSigns, main=null, version=1.4, author=Tomski - Creator of PropHunt, depends=[], file=null); Unable to find property 'website' on class: net.md_5.bungee.api.plugin.PluginDescription
 in 'reader', line 1, column 1:
    name: PropHuntSigns
    ^

	at org.yaml.snakeyaml.constructor.Constructor$ConstructYamlObject.construct(Constructor.java:333)
	at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:182)
	at org.yaml.snakeyaml.constructor.BaseConstructor.constructDocument(BaseConstructor.java:141)
	at org.yaml.snakeyaml.constructor.BaseConstructor.getSingleData(BaseConstructor.java:127)
	at org.yaml.snakeyaml.Yaml.loadFromReader(Yaml.java:481)
	at org.yaml.snakeyaml.Yaml.loadAs(Yaml.java:475)
	at net.md_5.bungee.api.plugin.PluginManager.detectPlugins(PluginManager.java:271)
	at net.md_5.bungee.BungeeCord.start(BungeeCord.java:240)
	at net.md_5.bungee.BungeeCord.main(BungeeCord.java:184)
Caused by: org.yaml.snakeyaml.error.YAMLException: Cannot create property=website for JavaBean=PluginDescription(name=PropHuntSigns, main=null, version=1.4, author=Tomski - Creator of PropHunt, depends=[], file=null); Unable to find property 'website' on class: net.md_5.bungee.api.plugin.PluginDescription
	at org.yaml.snakeyaml.constructor.Constructor$ConstructMapping.constructJavaBean2ndStep(Constructor.java:299)
	at org.yaml.snakeyaml.constructor.Constructor$ConstructMapping.construct(Constructor.java:189)
	at org.yaml.snakeyaml.constructor.Constructor$ConstructYamlObject.construct(Constructor.java:331)
	... 8 more
Caused by: org.yaml.snakeyaml.error.YAMLException: Unable to find property 'website' on class: net.md_5.bungee.api.plugin.PluginDescription
	at org.yaml.snakeyaml.introspector.PropertyUtils.getProperty(PropertyUtils.java:132)
	at org.yaml.snakeyaml.introspector.PropertyUtils.getProperty(PropertyUtils.java:121)
	at org.yaml.snakeyaml.constructor.Constructor$ConstructMapping.getProperty(Constructor.java:308)
	at org.yaml.snakeyaml.constructor.Constructor$ConstructMapping.constructJavaBean2ndStep(Constructor.java:240)
	... 10 more