I get this error, as well as extremely slow performance with a big TM I had upgraded to use upLIFT (which resulted in the DB becoming 4 times larger and unusable). This appears when I select that TM. When I click OK on the error I can use the TM but in Translation results window it will show "Searching..." which takes ages (not an issue with the same TM before upgrading it).
<SDLErrorDetails time="26/9/2019 9:14:05 μμ">
<ErrorMessage>Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index</ErrorMessage>
<Exception>
<Type>System.ArgumentOutOfRangeException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>
<ParamName>index</ParamName>
<HelpLink />
<Source>mscorlib</Source>
<HResult>-2146233086</HResult>
<StackTrace><![CDATA[ at System.ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument argument, ExceptionResource resource)
at System.Collections.Generic.List`1.get_Item(Int32 index)
at Sdl.TranslationStudio.Editor.TranslationMemory.ConcordanceSearchViewPartControl.GetCascadeEntry(Int32 cascadeEntryIndex)
at Sdl.TranslationStudio.Editor.TranslationMemory.CompoundTranslationMemorySearchResultsControl.SetSearchResults(SearchResults searchResults)
at Sdl.TranslationStudio.Editor.TranslationMemory.CompoundTranslationMemorySearchResultsControl.SetSearchResults(SearchResults searchResults, IEnumerable`1 cascadeMessages)
at Sdl.TranslationStudio.Editor.TranslationMemory.ConcordanceSearchViewPartControl.UpdateContent()
at Sdl.TranslationStudio.Editor.TranslationMemory.ConcordanceSearchViewPart.HandleTranslationProviderChanged()
at Sdl.TranslationStudio.Editor.TranslationMemory.ConcordanceSearchViewPart.TranslationProvider_CascadesChanged(Object sender, EventArgs e)
at System.EventHandler.Invoke(Object sender, EventArgs e)
at Sdl.TranslationStudio.Editor.TranslationMemory.EditorTranslationProvider.ResetTranslationMemories()
at Sdl.TranslationStudio.Editor.TranslationMemory.EditorTranslationProvider.CascadeItem_CascadeItemChanged(Object sender, CascadeItemChangedEventArgs e)
at Sdl.ProjectApi.ProjectCascadeItem.OnCascadeItemChanged(ProjectCascadeItem oldCascadeItem, ProjectCascadeItem newCascadeItem)
at Sdl.TranslationStudio.ProjectManagement.Settings.TranslationMemoriesSettingsPage.Save()
at Sdl.Desktop.Platform.Implementation.Settings.AbstractSettingsHost.OnSave(Boolean validateInput)]]></StackTrace>
</Exception>
<Environment>
<ProductName>SDL Trados Studio</ProductName>
<ProductVersion>15.0.0.0</ProductVersion>
<EntryAssemblyFileVersion>15.2.0.1041</EntryAssemblyFileVersion>
<OperatingSystem>Microsoft Windows 10 Pro</OperatingSystem>
<ServicePack>NULL</ServicePack>
<OperatingSystemLanguage>1033</OperatingSystemLanguage>
<CodePage>1253</CodePage>
<LoggedOnUser>PC\spiros</LoggedOnUser>
<DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>
<ComputerName>PC</ComputerName>
<ConnectedToNetwork>True</ConnectedToNetwork>
<PhysicalMemory>16725712 MB</PhysicalMemory>
</Environment>
</SDLErrorDetails>
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