Veeam Support Knowledge Base
"The given key was not present in the dictionary" error while opening nworks UI

"The given key was not present in the dictionary" error while opening nworks UI

KB ID:	1309
Product:	Veeam Management Pack for Microsoft System Center
Version:	5.x
Published:	2011-10-20
Last Modified:	2020-08-28

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Challenge

When opening nworks UI, the following error occurs:

"The given key was not present in the dictionary"

Cause

The maindb.xml file is corrupted for some reason.

Solution

It is necessary to remove the "maindb.xml" file in the following way:

Locate and backup file "C:\Documents and Settings\All Users\Application Data\nworks\Management Center\maindb.xml" (for Win 2008 the location is "C:\ProgramData\nworks\Management Center”)
Stop nworks Enterprise Manager (Management Center) service
Delete file "C:\Documents and Settings\All Users\Application Data\nworks\Management Center\maindb.xml" (for Win 2008 the location is "C:\ProgramData\nworks\Management Center”)
Start nworks Enterprise Manager (Management Center) service

Once the service is started again, "maindb.xml" will be re-created.

NOTE: Removing maindb.xml file removes all the vCenter connection configuration, each VEM server advanced property customization and VEM server ESX cluster assignments.

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