DEA 2.6 Startup Error – MEF GetExportedValue Prerequisite Import Failure
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Installing Microsoft Database Experimentation Assistant (DEA) v2.6 on Server 2022 fails to start with:
Tried:
Installed all dependencies (.NET 4.8, VC++ Redist, SQL Server 2022).
Uninstalled/reinstalled DEA, cleaned %appdata% and Program Files folders.
Ran as admin, updated Windows, checked Event Viewer.
Verified no locked DLLs or AV blocks.
Question:
What causes this MEF import failure in DEA 2.6 and how to fix it? Any way to force MEF to reload/resolve IConfigManager?
System.InvalidOperationException: GetExportedValue cannot be called before prerequisite import 'Microsoft.DEA.Logging.TraceLogger..ctor (Parameter="configManager", ContractName="Microsoft.DEA.ConfigurationManager.IConfigManager")' has been set.
Tried:
Installed all dependencies (.NET 4.8, VC++ Redist, SQL Server 2022).
Uninstalled/reinstalled DEA, cleaned %appdata% and Program Files folders.
Ran as admin, updated Windows, checked Event Viewer.
Verified no locked DLLs or AV blocks.
Question:
What causes this MEF import failure in DEA 2.6 and how to fix it? Any way to force MEF to reload/resolve IConfigManager?
Asked by Manthan Prabhu
(29 rep)
Aug 18, 2025, 04:32 AM
Last activity: Aug 19, 2025, 10:56 PM
Last activity: Aug 19, 2025, 10:56 PM