The given key was not present in the dictionary

An unhandled exception was generated during the execution of the current web request.
The given key was not present in the dictionary.

Situation: When trying to open one folder of SharePoint, the client get "The given key was not present in the dictionary. Description: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Resolution: 1. Deleted projecttrackingworkspace.wpg from central administrator-application management – solution management
2. Ran command: stsadm -o retractsolution -name "projecttrackingworkspace.wsp" –immediate.
3.Tried to add projecttrackingworkspace.wpg using this command: stsadm -o addsolution -filename 'c:/projecttrackingworkspace.wpg"
4. Tried to deploy projecttrackingworkspace.wpg using stsadm -o deploysolution -name "projecttrackingworkspace.wpg" –force

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