There is an error when the data is removed from scenario's mappable data window.

ERROR: ''
88805 - [ERROR] [edu.illinois.ncsa.ergo.gis.types.RendererContext]: could not save style
javax.xml.transform.TransformerException: java.lang.NullPointerException
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(Unknown Source)
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(Unknown Source)
at org.geotools.xml.transform.TransformerBase$Task.run(TransformerBase.java:300)
at org.geotools.xml.transform.TransformerBase.transform(TransformerBase.java:133)
at org.geotools.xml.transform.TransformerBase.transform(TransformerBase.java:121)
at org.geotools.xml.transform.TransformerBase.transform(TransformerBase.java:162)
at edu.illinois.ncsa.ergo.gis.util.StyleXMLUtils.styleToXml(StyleXMLUtils.java:231)
at edu.illinois.ncsa.ergo.gis.types.RendererContext.serializeLayersToElement(RendererContext.java:619)
at edu.illinois.ncsa.ergo.gis.types.Scenario.asElement(Scenario.java:751)
at ncsa.tools.common.util.XmlUtils.serializeUserFacingBean(XmlUtils.java:574)
at ncsa.tools.common.util.XmlUtils.serializeUserFacingBeanToFile(XmlUtils.java:587)
at ncsa.tools.common.util.XmlUtils.serializeUserFacingBeanToFile(XmlUtils.java:580)
at edu.illinois.ncsa.ergo.gis.managers.Manager.internalImmediateSave(Manager.java:381)
at edu.illinois.ncsa.ergo.gis.managers.Manager.access$0(Manager.java:375)
at edu.illinois.ncsa.ergo.gis.managers.Manager$SaveJob.run(Manager.java:355)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
Caused by: java.lang.NullPointerException
at org.geotools.styling.SLDTransformer$SLDTranslator.encode(SLDTransformer.java:1252)
at org.geotools.xml.transform.TransformerBase$XMLReaderSupport.parse(TransformerBase.java:1026)
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transformIdentity(Unknown Source)
... 16 more
---------
java.lang.NullPointerException
at org.geotools.styling.SLDTransformer$SLDTranslator.encode(SLDTransformer.java:1252)
at org.geotools.xml.transform.TransformerBase$XMLReaderSupport.parse(TransformerBase.java:1026)
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transformIdentity(Unknown Source)
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(Unknown Source)
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(Unknown Source)
at org.geotools.xml.transform.TransformerBase$Task.run(TransformerBase.java:300)
at org.geotools.xml.transform.TransformerBase.transform(TransformerBase.java:133)
at org.geotools.xml.transform.TransformerBase.transform(TransformerBase.java:121)
at org.geotools.xml.transform.TransformerBase.transform(TransformerBase.java:162)
at edu.illinois.ncsa.ergo.gis.util.StyleXMLUtils.styleToXml(StyleXMLUtils.java:231)
at edu.illinois.ncsa.ergo.gis.types.RendererContext.serializeLayersToElement(RendererContext.java:619)
at edu.illinois.ncsa.ergo.gis.types.Scenario.asElement(Scenario.java:751)
at ncsa.tools.common.util.XmlUtils.serializeUserFacingBean(XmlUtils.java:574)
at ncsa.tools.common.util.XmlUtils.serializeUserFacingBeanToFile(XmlUtils.java:587)
at ncsa.tools.common.util.XmlUtils.serializeUserFacingBeanToFile(XmlUtils.java:580)
at edu.illinois.ncsa.ergo.gis.managers.Manager.internalImmediateSave(Manager.java:381)
at edu.illinois.ncsa.ergo.gis.managers.Manager.access$0(Manager.java:375)
at edu.illinois.ncsa.ergo.gis.managers.Manager$SaveJob.run(Manager.java:355)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
90720 - [INFO] [edu.illinois.ncsa.ergo.gis.managers.ScenarioManager]: Saving Shelby to C:\Users\ywkim\NCSA\Ergo-EQ\managers\scenario\Shelby.xml