I have a source and client of RS2HD and i need some help with the source

Source
Code:
[2013/03/12 13:42:15] [GameEngine]: rs2hd framework
[2013/03/12 13:42:16] [GameEngine]: Loading Clans...
[2013/03/12 13:42:21] [GameEngine]: Loaded 7 clans.
[2013/03/12 13:42:21] [GameEngine]: Reading mapdata...
[2013/03/12 13:42:21] [GameEngine]: Loaded mapdata.
[2013/03/12 13:42:23] [GameEngine]: Packet handlers:
[2013/03/12 13:42:23] [GameEngine]:     Packet ChatPacketHandler bound to: [ 182
 ]
[2013/03/12 13:42:23] [GameEngine]:     Packet ChatboxPacketHandler bound to: [
147 ]
[2013/03/12 13:42:23] [GameEngine]:     Packet UserInput bound to: [ 206, 172 ]
[2013/03/12 13:42:23] [GameEngine]:     Packet WalkPacketHandler bound to: [ 163
, 119 ]
[2013/03/12 13:42:23] [GameEngine]:     Packet QuietPacketHandler bound to: [ 5,
 87, 255 ]
[2013/03/12 13:42:23] [GameEngine]:     Packet ActionButtonPacketHandler bound t
o: [ 5, 19, 89, 193, 216, 205, 173 ]
[2013/03/12 13:42:23] [GameEngine]:     Packet ClientAction bound to: [ 87, 170
]
[2013/03/12 13:42:23] [GameEngine]:     Packet NpcPacketHandler bound to: [ 232
]
[2013/03/12 13:42:23] [GameEngine]:     Packet PlayerPacketHandler bound to: [ 1
40, 114, 79, 114 ]
[2013/03/12 13:42:23] [GameEngine]:     Packet NpcPacketHandler bound to: [ 38,
207, 217, 254 ]
[2013/03/12 13:42:23] [GameEngine]:     Packet PlayPacketHandler bound to: [ 91
]
[2013/03/12 13:42:23] [GameEngine]:     Packet ItemPacketHandler bound to: [ 66,
 194, 117, 229, 234, 248, 253, 202 ]
[2013/03/12 13:42:23] [GameEngine]:     Packet ObjectPacketHandler bound to: [ 4
5, 190 ]
[2013/03/12 13:42:23] [GameEngine]:     Packet FriendsPacketHandler bound to: [
226, 123, 92 ]
[2013/03/12 13:42:23] [GameEngine]:     Packet ClanPacketHandler bound to: [ 47,
 36 ]
[2013/03/12 13:42:23] [GameEngine]:     Packet CommandScreenHandler bound to: [
171 ]
[2013/03/12 13:42:23] [GameEngine]: Loading item definitions...
[2013/03/12 13:42:29] [GameEngine]: Loaded 11633 item definitions.
[2013/03/12 13:42:29] [GameEngine]: Loading npc definitions...
[2013/03/12 13:42:29] [GameEngine]: Loaded 7 npc definitions.
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.converters.Conversi
onException: Cannot construct com.rs2hd.model.NPCDrop$Drop as it does not have a
 no-args constructor : Cannot construct com.rs2hd.model.NPCDrop$Drop as it does
not have a no-args constructor
---- Debugging information ----
message             : Cannot construct com.rs2hd.model.NPCDrop$Drop as it does n
ot have a no-args constructor
cause-exception     : com.thoughtworks.xstream.converters.reflection.ObjectAcces
***ception
cause-message       : Cannot construct com.rs2hd.model.NPCDrop$Drop as it does n
ot have a no-args constructor
class               : java.util.ArrayList
required-type       : com.rs2hd.model.NPCDrop$Drop
path                : /list/npcDrop/drops/drop
line number         : 5
-------------------------------
[2013/03/12 13:42:29] [GameEngine]: Cannot construct com.rs2hd.model.NPCDrop$Dro
p as it does not have a no-args constructor : Cannot construct com.rs2hd.model.N
PCDrop$Drop as it does not have a no-args constructor
---- Debugging information ----
message             : Cannot construct com.rs2hd.model.NPCDrop$Drop as it does n
ot have a no-args constructor
cause-exception     : com.thoughtworks.xstream.converters.reflection.ObjectAcces
***ception
cause-message       : Cannot construct com.rs2hd.model.NPCDrop$Drop as it does n
ot have a no-args constructor
class               : java.util.ArrayList
required-type       : com.rs2hd.model.NPCDrop$Drop
path                : /list/npcDrop/drops/drop
line number         : 5
-------------------------------
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.core.TreeUnmarshall
er.convert(TreeUnmarshaller.java:88)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.core.AbstractRefere
nceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:55)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.core.TreeUnmarshall
er.convertAnother(TreeUnmarshaller.java:75)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.core.TreeUnmarshall
er.convertAnother(TreeUnmarshaller.java:59)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.converters.collecti
ons.AbstractCollectionConverter.readItem(AbstractCollectionConverter.java:77)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.converters.collecti
ons.ArrayConverter.unmarshal(ArrayConverter.java:55)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.core.TreeUnmarshall
er.convert(TreeUnmarshaller.java:81)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.core.AbstractRefere
nceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:55)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.core.TreeUnmarshall
er.convertAnother(TreeUnmarshaller.java:75)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.converters.reflecti
on.AbstractReflectionConverter.unmarshallField(AbstractReflectionConverter.java:
234)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.converters.reflecti
on.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:206)

[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.converters.reflecti
on.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:150)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.core.TreeUnmarshall
er.convert(TreeUnmarshaller.java:81)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.core.AbstractRefere
nceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:55)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.core.TreeUnmarshall
er.convertAnother(TreeUnmarshaller.java:75)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.core.TreeUnmarshall
er.convertAnother(TreeUnmarshaller.java:59)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.converters.collecti
ons.AbstractCollectionConverter.readItem(AbstractCollectionConverter.java:77)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.converters.collecti
ons.CollectionConverter.populateCollection(CollectionConverter.java:68)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.converters.collecti
ons.CollectionConverter.unmarshal(CollectionConverter.java:61)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.core.TreeUnmarshall
er.convert(TreeUnmarshaller.java:81)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.core.AbstractRefere
nceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:55)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.core.TreeUnmarshall
er.convertAnother(TreeUnmarshaller.java:75)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.core.TreeUnmarshall
er.convertAnother(TreeUnmarshaller.java:59)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.core.TreeUnmarshall
er.start(TreeUnmarshaller.java:142)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.core.AbstractTreeMa
rshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:33)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.XStream.unmarshal(X
Stream.java:907)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.XStream.unmarshal(X
Stream.java:893)
[2013/03/12 13:42:29] [GameEngine]: com.thoughtworks.xstream.XStream.fromXML(XSt
ream.java:845)
[2013/03/12 13:42:29] [GameEngine]: com.rs2hd.model.NPCDrop.load(NPCDrop.java:18
)
[2013/03/12 13:42:29] [GameEngine]: com.rs2hd.model.NPCDefinition.load(NPCDefini
tion.java:31)
[2013/03/12 13:42:29] [GameEngine]: com.rs2hd.GameEngine.<init>(GameEngine.java:
94)
[2013/03/12 13:42:29] [GameEngine]: com.rs2hd.Server.<init>(Server.java:76)
[2013/03/12 13:42:29] [GameEngine]: com.rs2hd.Main$1.run(Main.java:35)
[2013/03/12 13:42:29] [GameEngine]: java.lang.Thread.run(Unknown Source)