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"Undefined is null or not an object" error when browsing Event Notification Solution (ENS 6.4) web pages on 64-bit versions of Windows

Goals and Symptoms

When browsing to ENS 6.4 pages on a 64-bit install, the following error is displayed:

'undefined' is null or not an object

Causes and Fixes


'Enable 32-bit applications' is set incorrectly in IIS.


1) Click Start Menu-> Administrative Tools -> Internet information Services (IIS) Manager.

2) Click on Application Pools from the Connections tab on the left hand side.
3) Select "eSolPool" and click on "Advanced Settings" from the Actions tab on right hand side.

4) A pop up window will appear on screen, under General section, set "Enable 32-Bit Applications" to False. Click OK.

5) Recycle the "eSolPool" and re-launch the ENS website. Recycle can be found on the right hand side of the screen in the Actions window.

Legacy KB System (APS) Data: RESL207462 V1.0, Originally authored by MaTh on 02/22/2012, Last Edited by MaTh on 02/22/2012
Related ranges: SMS Add-on, Paging Module
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