# Event Manager:Unknown Error
**URL:** https://tech-community.robotics.abb.com/t/event-manager-unknown-error/3448
**Category:** RobotStudio
**Created:** [March 15, 2010, 1:04pm UTC](https://tech-community.robotics.abb.com/t/event-manager-unknown-error/3448 "2010-03-15T13:04:24Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@JLove](https://tech-community.robotics.abb.com/u/JLove)
#### Post date: [March 15, 2010, 1:04pm UTC](https://tech-community.robotics.abb.com/t/event-manager-unknown-error/3448/1 "2010-03-15T13:04:24Z")
For some reason when I try to start event manager in my application I am getting this error.
# RobotStudio .NET exception: Unknown Error: Event Manager
Base exception: NullReferenceException
Object reference not set to an instance of an object.
at EventManager.EventTableViewerUI.ExtractEntryInfo(EventTableEntry entry, Boolean& valid)
at EventManager.EventTableViewerUI.CreateNewEntryItem(EventTableEntry entry)
at EventManager.EventTableViewerUI.UpdateListView(EventTable eventTable)
at EventManager.EventTableManagerUI.PopulateListViewWithEvents()
at EventManager.EventTableManagerUI..ctor()
at EventManager.EventTableManager.InitEventTableManager()
at EventManager.EventTableManager.EventTableManager\_ExecuteCommand(Object sender, ExecuteCommandEventArgs e)
at ABB.Robotics.RobotStudio.Environment.CommandBarButton.RaiseExecuteCommand()
I have already put 3 weeks into this project and really do not want to have to start over.
Please help.
---
### Author:  [@Henrik\_Berlin](https://tech-community.robotics.abb.com/u/Henrik_Berlin)
#### Post date: [March 15, 2010, 2:31pm UTC](https://tech-community.robotics.abb.com/t/event-manager-unknown-error/3448/2 "2010-03-15T14:31:28Z")
Please contact your local ABB Representative. Include an .rspag with your station and information about the version your are using.