"Error Id XDMI:1C3CA121, Exception : System.NullReferenceException Object reference not set to an instance of an object" While Upgrading from XD7.5 to 7.7

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Article ID: CTX206014

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Updated On:

Description

If we run the ISO of XA7.7 on the SF Server or on the Controller we get the following error as soon as we click on upgrade:

"Error Id XDMI:1C3CA121, Exception : System.NullReferenceException Object reference not set to an instance of an object"

Environment

Caution! Using Registry Editor incorrectly can cause serious problems that might require you to reinstall your operating system. Citrix cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk. Be sure to back up the registry before you edit it.

Resolution

Install .Net Framework 4.5.2 as well as Visual C++ 2008 SP1 Redistributable Package.
Move the XenApp Controllers and StoreFront Servers Computer Accounts to a New OU in AD and Block Inheritance.
Make sure that we don’t have any policies getting applied from AD to User Account or Computer Account that prevents running the ISO for installation/upgrade.
Moreover take Snapshots of both StoreFront Servers, XenApp Controllers and License Server on XenServer and a Full XenApp Database Backup After following the above recommendations, the Issue got resolved and we were able to upgrade the Storefront Servers and the XenApp Controllers.

Work Around: Login to the SF Servers and the DDCs with Local Administrator Account and run the ISO

Problem Cause

Policies.

Issue/Introduction

-If we run the ISO of XA7.7 on the SF Server or on the Controller we get the following error as soon as we click on upgrade: • Error Id XDMI:1C3CA121, Exception : System.NullReferenceException Object reference not set to an instance of an object

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