When xmlserializer.deserialize encounters a node/tag which does not map to an object?

exception of type 'System.InvalidOperationException' occurred in Microsoft.GeneratedCode and wasn't handled before a managed/native boundary

Additional information: <Incident xmlns=''> was not expected.

string dataXml = (string)dbDataReader["DataXML"];
XmlSerializer xmlSerializer = new XmlSerializer(typeof(Incident), new XmlRootAttribute { ElementName = "IncidentGet" });
System.IO.TextReader textReader = new System.IO.StringReader(dataXml);
incident = (Incident)xmlSerializer.Deserialize(textReader);

<incident>
	<incidentnum>20180323905
	<OccurredOn />
	<reportedon>2019-02-01
	<reportingofficer>TEST,TEST
	<location>
		<recnum>102953131
		<house>4471
		<street>TESTSTREETNAME2 PK
		<CrossStreet />
		<streetaddr>4471 TESTSTREETNAME2 PK
		<city>TESTCITY
		<state>TN
		<zip>37013
		<X />
		<Y />
		<Latitude />
		<Longitude />
		<county>019
		<Validated />
		<precinct>SOUTH
		<RPA />
		<Zone />
		<countrycode>USA
	
	<offenses>
		<offense>
			<code>120</code>
			<description>ROBBERY - STREET-WEAPON
		
		<offense>
			<code>
			<description>MATTEROFRECORD
		</code><code>
	</code><code>
	<victims>
		<victim>
			<involvementnum>1
			<race>B
			<sex>F
			<dob>1988-07-13
			<name>TESTNAME2,TESTNAME3
			<masterrecnum>71931912
		
	
	<victimoffenses>
		<victimoffense>
			<offensecode>0003
			<NibCode />
			<offensename>MATTER OF RECORD
			<victimnum>1
			<linkofflrecnum>60036199
			<linkoffloffenserec>13808415
			<linkofflrecnum>6296009
			<linkvictimrecnum>71931912
		
	
	<relationships>
		<relationship>
			<victimnumber>1
			<suspectnumber>1
			<relation>17
			<victimname>TESTNAME3 TESTNAME2
			<suspectname>TESTNAME4 TESTNAME5
			<linkincsusrecnum>6356248
		
	
	<suspects>
		<suspect>
			<suspecttype>KNOWN
			<involvementnum>1
			<race>B
			<sex>M
			<dob>07/16/1987
			<Age />
			<name>TESTNAME5, TESTNAME4
			<linkincsusrecnum>6356248
			<source_rec>60036198
		
	
	<callsforservice>
		<callforservice>
			<location>
				<recnum>102524782
				<House />
				<Street />
				<crossstreet>17TH AV N
				<streetaddr>1600 TESTSTREETNAME ST
				<city>NORTH
				<State />
				<Zip />
				<X />
				<Y />
				<Latitude />
				<Longitude />
				<County />
				<Validated />
				<precinct>NORTH
				<rpa>4475
				<zone>613N
				<CountryCode />
			
			<callreceived>20180411 05:07
			<tencode>41P