om.borland.dx.dataset.DataSetException: Operation cannot be performed on an open DataSet. Close the DataSet first.

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Operation cannot be performed on an open DataSet. Close the DataSet first.
om.borland.dx.dataset.DataSetException: Operation cannot be performed on an open DataSet. Close the DataSet first.
at com.borland.dx.dataset.DataSetException.c(Unknown Source)
at com.borland.dx.dataset.DataSetException.y(Unknown Source)
at com.borland.dx.dataset.StorageDataSet.s(Unknown Source)
at com.borland.dx.dataset.ProviderHelp.failIfOpen(Unknown Source)
at com.borland.dx.sql.dataset.QueryDataSet.setQuery(Unknown Source)
at release0.Applet1.jButton1_actionPerformed(Applet1.java:154)
at release0.Applet1$1.actionPerformed(Applet1.java:66)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1450)
at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1504)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:378)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:250)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:216)
at java.awt.Component.processMouseEvent(Component.java:3717)
at java.awt.Component.processEvent(Component.java:3546)
at java.awt.Container.processEvent(Container.java:1167)
at java.awt.Component.dispatchEventImpl(Component.java:2595)
at java.awt.Container.dispatchEventImpl(Container.java:1216)
at java.awt.Component.dispatchEvent(Component.java:2499)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:2458)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:2223)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2132)
at java.awt.Container.dispatchEventImpl(Container.java:1203)
at java.awt.Component.dispatchEvent(Component.java:2499)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:336)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:134)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:96)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:88)

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