I am not able to reopen any of my image which i made in this. I dont know how to fix it.. please help.
	 
	 
	java.io.IOException
	at com.yworks.A.B.W.ă(Unknown Source)
	at com.yworks.A.B.W.ā(Unknown Source)
	at com.yworks.A.J.P.ā(Unknown Source)
	at com.yworks.A.J.P.ā(Unknown Source)
	at com.yworks.A.J.G.ā(Unknown Source)
	at com.yworks.A.J.G.ą(Unknown Source)
	at com.yworks.A.J.P$B.Ă(Unknown Source)
	at com.yworks.A.J.P.ā(Unknown Source)
	at com.yworks.A.K.D.ā(Unknown Source)
	at com.yworks.A.K.j.actionPerformed(Unknown Source)
	at java.desktop/javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
	at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
	at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
	at java.desktop/javax.swing.DefaultButtonModel.setPressed(Unknown Source)
	at java.desktop/javax.swing.AbstractButton.doClick(Unknown Source)
	at java.desktop/javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
	at java.desktop/javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)
	at java.desktop/java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
	at java.desktop/java.awt.Component.processMouseEvent(Unknown Source)
	at java.desktop/javax.swing.JComponent.processMouseEvent(Unknown Source)
	at java.desktop/java.awt.Component.processEvent(Unknown Source)
	at java.desktop/java.awt.Container.processEvent(Unknown Source)
	at java.desktop/java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.desktop/java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.desktop/java.awt.Component.dispatchEvent(Unknown Source)
	at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
	at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
	at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
	at java.desktop/java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.desktop/java.awt.Window.dispatchEventImpl(Unknown Source)
	at java.desktop/java.awt.Component.dispatchEvent(Unknown Source)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(Unknown Source)
	at java.desktop/java.awt.EventQueue.access$600(Unknown Source)
	at java.desktop/java.awt.EventQueue$4.run(Unknown Source)
	at java.desktop/java.awt.EventQueue$4.run(Unknown Source)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
	at java.desktop/java.awt.EventQueue$5.run(Unknown Source)
	at java.desktop/java.awt.EventQueue$5.run(Unknown Source)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
	at java.desktop/java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.desktop/java.awt.EventDispatchThread.run(Unknown Source)
	Caused by: java.lang.NullPointerException
	at y.I.aB.calculateOffset(Unknown Source)
	at y.I.X.getOffset(Unknown Source)
	at y.I.aB.getOrientedBox(Unknown Source)
	at y.I.X.getBox(Unknown Source)
	at y.I.A.C.ă(Unknown Source)
	at y.I.A.C.ĥ(Unknown Source)
	at y.I.TA$P.ā(Unknown Source)
	at y.I.TA$P.ā(Unknown Source)
	at y.I.TA.read(Unknown Source)
	at y.I.A.T.read(Unknown Source)
	at y.I.R.read(Unknown Source)
	at y.H.E.ă(Unknown Source)
	at y.H.E.ā(Unknown Source)
	at y.H.E.Ă(Unknown Source)
	at y.H.E.Ă(Unknown Source)
	at y.H.E.ā(Unknown Source)
	at com.yworks.A.B.G.S.ā(Unknown Source)
	at y.H.G.ā(Unknown Source)
	at y.B.A.M.Đ(Unknown Source)
	at y.B.d.č(Unknown Source)
	at y.B.d.ā(Unknown Source)
	at y.B.d.ă(Unknown Source)
	... 49 more
	 
	Thanks.