Error: (100) System Exception: Add failed. Duplicate key value supplied...

Scenario

Error message
(100) System.Exception: System.ArgumentException: Add failed. Duplicate key value supplied. at Microsoft.VisualBasic.Collection.Add(Object Item, String Key, Object Before, Object After) at GFR_LookuplistSync.IniFile.Initialize() at GFR_LookuplistSync.SyncLookuplist.tmrSyncLookuplist_Elapsed(Object sender, ElapsedEventArgs e)

Cause

The Lookup List Sync contains multiple list queries with identical information.

Solution

Follow the steps below to remove duplicate list queries, and then restart the Lookup List Sync service.
  1. Navigate to the appropriate location below, based on the operating system on the computer where the Lookup List Sync service is installed.
    • 64-bit operating system:
      C:\Program Files (x86)\GoFileRoom\GFRLookupListSync.
    • 32-bit operating system:
      C:\Program Files\GoFileRoom\GFRLookupListSync.
  2. Right-click the
    GFR_LookupListSync INI (Manage).exe
    file, then select
    Run as administrator
    .
  3. Select the
    List
    tab.
  4. Delete any duplicate queries, select
    Apply
    and then
    OK
    .
  5. Select the Windows Start button, then select
    Run
    . Enter
    services.msc
    in the Open field.
  6. Locate the GFR Lookup List Sync service. Right-click the service, then select
    Restart
    .

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