# Transactional group OPC browse error

**URL:** <https://forum.inductiveautomation.com/t/transactional-group-opc-browse-error/1497>\
**Category:** Ignition\
**Created:** [February 4, 2010, 7:23pm UTC](https://forum.inductiveautomation.com/t/transactional-group-opc-browse-error/1497 "2010-02-04T19:23:09Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![david\_mccutchen](https://avatars.discourse-cdn.com/v4/letter/d/919ad9/32.png) [@david\_mccutchen](https://forum.inductiveautomation.com/u/david_mccutchen)\
**Post date:** [February 4, 2010, 7:23pm UTC](https://forum.inductiveautomation.com/t/transactional-group-opc-browse-error/1497/1 "2010-02-04T19:23:09Z")

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When editing a group item and selecting to browse the opc servers(Doesn’t matter if it is OPCUA or Kep) the following fault occurs and won’t let you browse.

`java.lang.NullPointerException
	at com.inductiveautomation.ignition.designer.sqltags.opcbrowser.OPCTreeModel.<init>(OPCTreeModel.java:29)
	at com.inductiveautomation.ignition.designer.sqltags.opcbrowser.OPCBrowserBasePanel.itemStateChanged(OPCBrowserBasePanel.java:144)
	at javax.swing.JComboBox.fireItemStateChanged(Unknown Source)
	at javax.swing.JComboBox.selectedItemChanged(Unknown Source)
	at javax.swing.JComboBox.contentsChanged(Unknown Source)
	at javax.swing.AbstractListModel.fireContentsChanged(Unknown Source)
	at javax.swing.DefaultComboBoxModel.setSelectedItem(Unknown Source)
	at com.inductiveautomation.ignition.designer.gui.AbstractProfileOptionDropdown.setSelectedItem(AbstractProfileOptionDropdown.java:69)
	at com.inductiveautomation.ignition.designer.sqltags.opcbrowser.OPCBrowserBasePanel.setProvider(OPCBrowserBasePanel.java:133)
	at com.inductiveautomation.ignition.designer.sqltags.opcbrowser.OPCChooser.createContentPanel(OPCChooser.java:62)
	at com.jidesoft.dialog.StandardDialog$DefaultStandardDialogPane.createContentPanel(Unknown Source)
	at com.jidesoft.dialog.StandardDialogPane.initComponents(Unknown Source)
	at com.jidesoft.dialog.StandardDialog.initComponents(Unknown Source)
	at com.inductiveautomation.ignition.designer.sqltags.opcbrowser.OPCChooser.chooseOPCItem(OPCChooser.java:144)
	at com.inductiveautomation.ignition.designer.sqltags.editor.ChooseOPCButton.actionPerformed(ChooseOPCButton.java:57)
	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
	at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
	at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
	at java.awt.Component.processMouseEvent(Unknown Source)
	at javax.swing.JComponent.processMouseEvent(Unknown Source)
	at java.awt.Component.processEvent(Unknown Source)
	at java.awt.Container.processEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Window.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)
Ignition v7.0.1 (b4446)
Java: Sun Microsystems Inc. 1.6.0_11
`

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<div class="post-metadata">

**Author:** ![Carl.Gould](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/carl.gould/32/7262_2.png) [@Carl.Gould](https://forum.inductiveautomation.com/u/Carl.Gould)\
**Post date:** [February 4, 2010, 9:40pm UTC](https://forum.inductiveautomation.com/t/transactional-group-opc-browse-error/1497/2 "2010-02-04T21:40:46Z")

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Thanks for the report, we’ll get this fixed. We must have gotten so used to just dragging and dropping from the OPC browser into the transaction group’s items table that we missed this one.