I cannot download data and receive this error. I have an IEX API key. From 

https://iexcloud.io/PS C:\Users\amh\Lean\Toolbox\bin\Debug> ./QuantConnect.ToolBox.exe --app=IEXDownloader --tickers=NFLX --resolution=Daily --from-date=20180101-00:00:00 --to-date=20181231-00:00:00 --api-key=??? 20201003 09:19:11.659 Trace:: Config.Get(): Configuration key not found. Key: data-directory - Using default value: ../../../Data 20201003 09:19:11.666 Trace:: Config.Get(): Configuration key not found. Key: iex-cloud-api-key - Using default value: 20201003 09:19:11.666 Trace:: Config.Get(): Configuration key not found. Key: plugin-directory - Using default value: 20201003 09:19:11.669 Trace:: Config.Get(): Configuration key not found. Key: composer-dll-directory - Using default value: C:\Users\amh\Lean\Toolbox\bin\Debug\ 20201003 09:19:11.774 Trace:: Config.Get(): Configuration key not found. Key: data-aggregator - Using default value: QuantConnect.Lean.Engine.DataFeeds.AggregationManager 20201003 09:19:11.778 Trace:: IEXDataQueueHandler(): The IEX API key was not provided, history calls will return no data. 20201003 09:19:11.779 Trace:: Config.Get(): Configuration key not found. Key: map-file-provider - Using default value: LocalDiskMapFileProvider 20201003 09:19:11.790 Trace:: Config.Get(): Configuration key not found. Key: data-directory - Using default value: ../../../Data/ 20201003 09:19:11.791 Trace:: Config.Get(): Configuration key not found. Key: version-id - Using default value: 20201003 09:19:11.791 Trace:: Config.Get(): Configuration key not found. Key: cache-location - Using default value: ../../../Data/ 20201003 09:19:11.846 ERROR:: IEXDataQueueHandler.GetHistory(): History calls for IEX require an API key. 20201003 09:19:11.849 Trace:: IEXDataQueueHandler.Dispose(): Disconnected from IEX live data 20201003 09:19:13.583 ERROR:: <>c__DisplayClass4_0.<.ctor>b__0(): System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information. at System.Reflection.RuntimeModule.GetTypes(RuntimeModule module) at System.Reflection.RuntimeModule.GetTypes() at System.Reflection.Assembly.GetTypes() at System.ComponentModel.Composition.Hosting.AssemblyCatalog.get_InnerCatalog() at System.ComponentModel.Composition.Hosting.AssemblyCatalog.GetEnumerator() at System.Linq.Enumerable.<SelectManyIterator>d__17`2.MoveNext() at System.Linq.Enumerable.<SelectManyIterator>d__17`2.MoveNext() at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source) at QuantConnect.Util.Composer.<>c__DisplayClass4_0.<.ctor>b__0() in C:\Users\amh\Lean\Common\Util\Composer.cs:line 80

 

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