How to solve an Illegal Value Exception in ExpressionBuilder

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How to solve an Illegal Value Exception in ExpressionBuilder

using Talend Perl 2.4, I have sometimes an Illegal Value Exception in ExpressionBuilder when lauching ExpressionBuilder. The message is as follows:
ERROR: org.eclipse.emf.ecore.xmi.IllegalValueException: Value '="tr' is not legal. (file:/home/jmax/workspace/COR/configuration/ExpressionBuilder/contractant.xml, 291, 87)
org.eclipse.emf.ecore.resource.impl.ResourceSetImpl$1DiagnosticWrappedException: org.eclipse.emf.ecore.xmi.IllegalValueException: Value '="tr' is not legal. (file:/home/jmax/workspace/COR/configuration/ExpressionBuilder/contractant.xml, 291, 87)
at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.handleDemandLoadException(ResourceSetImpl.java:316)
at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandLoadHelper(ResourceSetImpl.java:275)
at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.getResource(ResourceSetImpl.java:398)
at org.talend.expressionbuilder.ExpressionPersistance.initContents(Unknown Source)
at org.talend.expressionbuilder.ExpressionPersistance.loadExpression(Unknown Source)
at org.talend.expressionbuilder.ui.ExpressionBuilderDialog.openDialog(Unknown Source)
at org.talend.commons.ui.swt.tableviewer.celleditor.CellEditorDialogBehavior$1.mouseUp(Unknown Source)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:206)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1101)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3319)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2971)
at org.talend.designer.mapper.MapperComponent.open(Unknown Source)
at org.talend.designer.core.ui.editor.nodes.NodePart.performRequest(Unknown Source)
at org.eclipse.gef.tools.SelectEditPartTracker.performOpen(SelectEditPartTracker.java:187)
at org.eclipse.gef.tools.SelectEditPartTracker.handleDoubleClick(SelectEditPartTracker.java:131)
at org.eclipse.gef.tools.AbstractTool.mouseDoubleClick(AbstractTool.java:944)
at org.eclipse.gef.tools.SelectionTool.mouseDoubleClick(SelectionTool.java:501)
How to decode the line numbers and fix the error in my code ?
thanks for your tips

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