XSD registration and reference fails in the Portal

Document ID : KB000008580
Last Modified Date : 14/02/2018
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Issue:

In the TDM Portal I am able to reference an XSD file. However, when I click on the object, an error which references %CATDMWEB_APPDATA% appears. 

I was receiving a similar error in invoking a Javelin flow via the Portal.  How can I resolve this issue?
Environment:
TDM Portal 4.0, 4.1
Cause:

Issue is that the installer was not able to initialize the variable,  and as a result,  the value was left as undefined.   This has been fixed in TDM 4.2. 
Resolution:

To address this issue,  all you need to do is set up an environment variable as shown below (assuming a default install of the TDM Portal)

CATDMWEB_APPDATA=C:\ProgramData\CA\CA Test Data Manager Portal\

If you need to know how to create an environment variable, you can refer to this document from Microsoft.