Log here, it crashed the server right out and triggers an attempted restart loop.

20:18:35.3391 [DEBUG] Keen: MOD SKIPPED, Cannot load definition file, Following Error occured:
'xsi' is an undeclared prefix. Line 2, position 18.
System.Xml
at System.Xml.XmlTextReaderImpl.Throw(Exception e)
at System.Xml.XmlTextReaderImpl.LookupNamespace(NodeData node)
at System.Xml.XmlTextReaderImpl.AttributeNamespaceLookup()
at System.Xml.XmlTextReaderImpl.ParseAttributes()
at System.Xml.XmlTextReaderImpl.ParseElement()
at System.Xml.XmlTextReaderImpl.ParseElementContent()
at System.Xml.XmlReader.MoveToContent()
at System.Xml.XmlReader.IsStartElement()
at Sandbox.Definitions.MyDefinitionManager.CheckXmlForPrefabs(String file, List`1& prefabs, Stream readStream)
at Sandbox.Definitions.MyDefinitionManager.CheckPrefabs(String file)
at Sandbox.Definitions.MyDefinitionManager.<>c__DisplayClass32_0.<GetDefinitionBuilders>b__1(String file)
20:18:35.3391 [DEBUG] Keen: ERROR: Exception during objectbuilder read! (xml): MyObjectBuilder_Definitions
20:18:35.3391 [ERROR] Keen: System.InvalidOperationException: There is an error in the XML document. ---> System.InvalidOperationException: <ResearchBlocks xmlns=''> was not expected.
at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReader1.Read5974_Definitions()
at Microsoft.Xml.Serialization.GeneratedAssembly.MyObjectBuilder_DefinitionsSerializer.Deserialize(XmlSerializationReader reader)
at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader, String encodingStyle, XmlDeserializationEvents events)
--- End of inner exception stack trace ---
at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader, String encodingStyle, XmlDeserializationEvents events)
at VRage.ObjectBuilders.MyObjectBuilderSerializer.DeserializeXML(Stream reader, MyObjectBuilder_Base& objectBuilder, Type builderType, Dictionary`2 typeOverrideMap)
System.InvalidOperationException: There is an error in the XML document. ---> System.InvalidOperationException: <ResearchBlocks xmlns=''> was not expected.
at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReader1.Read5974_Definitions()
at Microsoft.Xml.Serialization.GeneratedAssembly.MyObjectBuilder_DefinitionsSerializer.Deserialize(XmlSerializationReader reader)
at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader, String encodingStyle, XmlDeserializationEvents events)
--- End of inner exception stack trace ---
at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader, String encodingStyle, XmlDeserializationEvents events)
at VRage.ObjectBuilders.MyObjectBuilderSerializer.DeserializeXML(Stream reader, MyObjectBuilder_Base& objectBuilder, Type builderType, Dictionary`2 typeOverrideMap)







20:18:35.3391 [DEBUG] Keen: Failed to deserialize file 'C:\SEServer\Instance\content\244850\1386092385\Data\ResearchBlocks.sbc'
20:18:35.3391 [DEBUG] Keen: MOD_CRITICAL_ERROR: Elite Sensor
20:18:35.3391 [DEBUG] Keen: in file: C:\SEServer\Instance\content\244850\1386092385\Data\ResearchBlocks.sbc
20:18:35.3391 [DEBUG] Keen: MOD SKIPPED, Cannot load definition file
20:18:35.3494 [INFO] Keen: Exception while loading world: One or more errors occurred.




Its in the Research Blocks File.