Caused by: java.lang.IllegalArgumentException: The object can not be converted to json string
	at org.ametys.runtime.util.JSONUtils.convertObjectToJson(JSONUtils.java:194)
	at org.ametys.runtime.cocoon.JSonReader.generate(JSonReader.java:59)
	at org.apache.cocoon.components.pipeline.impl.AbstractCachingProcessingPipeline.processReader(AbstractCachingProcessingPipeline.java:921)
	... 54 more
Caused by: org.codehaus.jackson.map.JsonMappingException: (was java.lang.NullPointerException) (through reference chain: java.util.HashMap["unlocked-contents"]->java.util.ArrayList[0]->java.util.HashMap["description"])
	at org.codehaus.jackson.map.JsonMappingException.wrapWithPath(JsonMappingException.java:218)
	at org.codehaus.jackson.map.JsonMappingException.wrapWithPath(JsonMappingException.java:183)
	at org.codehaus.jackson.map.ser.std.SerializerBase.wrapAndThrow(SerializerBase.java:140)
	at org.codehaus.jackson.map.ser.std.MapSerializer.serializeFields(MapSerializer.java:266)
	at org.codehaus.jackson.map.ser.std.MapSerializer.serialize(MapSerializer.java:186)
	at org.codehaus.jackson.map.ser.std.MapSerializer.serialize(MapSerializer.java:23)
	at org.codehaus.jackson.map.ser.std.StdContainerSerializers$IndexedListSerializer.serializeContents(StdContainerSerializers.java:122)
	at org.codehaus.jackson.map.ser.std.StdContainerSerializers$IndexedListSerializer.serializeContents(StdContainerSerializers.java:71)
	at org.codehaus.jackson.map.ser.std.AsArraySerializerBase.serialize(AsArraySerializerBase.java:86)
	at org.codehaus.jackson.map.ser.std.MapSerializer.serializeFields(MapSerializer.java:262)
	at org.codehaus.jackson.map.ser.std.MapSerializer.serialize(MapSerializer.java:186)
	at org.codehaus.jackson.map.ser.std.MapSerializer.serialize(MapSerializer.java:23)
	at org.codehaus.jackson.map.ser.StdSerializerProvider._serializeValue(StdSerializerProvider.java:610)
	at org.codehaus.jackson.map.ser.StdSerializerProvider.serializeValue(StdSerializerProvider.java:256)
	at org.codehaus.jackson.map.ObjectMapper.writeValue(ObjectMapper.java:1613)
	at org.ametys.runtime.util.JSONUtils.convertObjectToJson(JSONUtils.java:188)
	... 56 more
Caused by: java.lang.NullPointerException
	at org.apache.cocoon.i18n.XMLResourceBundleFactory.getSourceURI(XMLResourceBundleFactory.java:369)
	at org.apache.cocoon.i18n.XMLResourceBundleFactory.getCacheKey(XMLResourceBundleFactory.java:324)
	at org.apache.cocoon.i18n.XMLResourceBundleFactory._select(XMLResourceBundleFactory.java:238)
	at org.apache.cocoon.i18n.XMLResourceBundleFactory.select(XMLResourceBundleFactory.java:207)
	at org.ametys.runtime.util.I18nUtils._translate(I18nUtils.java:245)
	at org.ametys.runtime.util.I18nUtils.translate(I18nUtils.java:178)
	at org.ametys.runtime.util.I18nUtils.translate(I18nUtils.java:145)
	at org.ametys.runtime.util.I18nizableTextSerializer.serialize(I18nizableTextSerializer.java:68)
	at org.ametys.runtime.util.I18nizableTextSerializer.serialize(I18nizableTextSerializer.java:1)