We started getting this error just today. We haven't upgraded any package related to UmbracoFileSystemProviders.Azure. I already checked the dependency of the plugin and ProductionBreakpointsHostingObserver did not show up on any of the dependent assemblies. What could be causing the error?

 2018-05-02 04:19:31,028 [P7404/D2/T1] ERROR Umbraco.Core.CoreBootManager - An error occurred running OnApplicationStarting for handler Our.Umbraco.FileSystemProviders.Azure.VirtualPathProviderController
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> Microsoft.WindowsAzure.Storage.StorageException: Could not load file or assembly 'ProductionBreakpointsHostingObserver, Version=1.0.0.0, Culture=neutral, PublicKeyToken=8d3bb6c79cff225a' or one of its dependencies. The system cannot find the file specified. ---> System.IO.FileNotFoundException: Could not load file or assembly 'ProductionBreakpointsHostingObserver, Version=1.0.0.0, Culture=neutral, PublicKeyToken=8d3bb6c79cff225a' or one of its dependencies. The system cannot find the file specified.
   at System.Net.Configuration.DefaultProxySectionInternal.get_ClassSyncObject()
   at System.Net.Configuration.DefaultProxySectionInternal.GetSection()
   at System.Net.WebRequest.get_InternalDefaultWebProxy()
   at System.Net.HttpWebRequest..ctor(Uri uri, ServicePoint servicePoint)
   at System.Net.HttpRequestCreator.Create(Uri Uri)
   at System.Net.WebRequest.Create(Uri requestUri, Boolean useUriBase)
   at System.Net.WebRequest.Create(Uri requestUri)
   at Microsoft.WindowsAzure.Storage.Shared.Protocol.HttpWebRequestFactory.CreateWebRequest(String method, Uri uri, Nullable`1 timeout, UriQueryBuilder builder, Boolean useVersionHeader, OperationContext operationContext) in c:\Program Files (x86)\Jenkins\workspace\release_dotnet_master\Lib\ClassLibraryCommon\Shared\Protocol\HttpWebRequestFactory.cs:line 61
   at Microsoft.WindowsAzure.Storage.Blob.Protocol.ContainerHttpWebRequestFactory.Create(Uri uri, Nullable`1 timeout, Boolean useVersionHeader, OperationContext operationContext, BlobContainerPublicAccessType accessType) in c:\Program Files (x86)\Jenkins\workspace\release_dotnet_master\Lib\ClassLibraryCommon\Blob\Protocol\ContainerHttpWebRequestFactory.cs:line 89
   at Microsoft.WindowsAzure.Storage.Blob.CloudBlobContainer.<>c__DisplayClass24.<CreateContainerImpl>b__21(Uri uri, UriQueryBuilder builder, Nullable`1 serverTimeout, Boolean useVersionHeader, OperationContext ctx) in c:\Program Files (x86)\Jenkins\workspace\release_dotnet_master\Lib\ClassLibraryCommon\Blob\CloudBlobContainer.cs:line 2508
   at Microsoft.WindowsAzure.Storage.Core.Executor.Executor.ProcessStartOfRequest[T](ExecutionState`1 executionState, String startLogMessage) in c:\Program Files (x86)\Jenkins\workspace\release_dotnet_master\Lib\ClassLibraryCommon\Core\Executor\Executor.cs:line 849
   at Microsoft.WindowsAzure.Storage.Core.Executor.Executor.ExecuteSync[T](RESTCommand`1 cmd, IRetryPolicy policy, OperationContext operationContext) in c:\Program Files (x86)\Jenkins\workspace\release_dotnet_master\Lib\ClassLibraryCommon\Core\Executor\Executor.cs:line 619
   --- End of inner exception stack trace ---
   at Microsoft.WindowsAzure.Storage.Core.Executor.Executor.ExecuteSync[T](RESTCommand`1 cmd, IRetryPolicy policy, OperationContext operationContext) in c:\Program Files (x86)\Jenkins\workspace\release_dotnet_master\Lib\ClassLibraryCommon\Core\Executor\Executor.cs:line 632
   at Microsoft.WindowsAzure.Storage.Blob.CloudBlobContainer.Create(BlobContainerPublicAccessType accessType, BlobRequestOptions requestOptions, OperationContext operationContext) in c:\Program Files (x86)\Jenkins\workspace\release_dotnet_master\Lib\ClassLibraryCommon\Blob\CloudBlobContainer.cs:line 68
   at Microsoft.WindowsAzure.Storage.Blob.CloudBlobContainer.CreateIfNotExists(BlobContainerPublicAccessType accessType, BlobRequestOptions requestOptions, OperationContext operationContext) in c:\Program Files (x86)\Jenkins\workspace\release_dotnet_master\Lib\ClassLibraryCommon\Blob\CloudBlobContainer.cs:line 233
   at Microsoft.WindowsAzure.Storage.Blob.CloudBlobContainer.CreateIfNotExists(BlobRequestOptions requestOptions, OperationContext operationContext) in c:\Program Files (x86)\Jenkins\workspace\release_dotnet_master\Lib\ClassLibraryCommon\Blob\CloudBlobContainer.cs:line 196
   at Our.Umbraco.FileSystemProviders.Azure.AzureFileSystem.CreateContainer(CloudBlobClient cloudBlobClient, String containerName, BlobContainerPublicAccessType accessType)
   at Our.Umbraco.FileSystemProviders.Azure.AzureFileSystem..ctor(String containerName, String rootUrl, String connectionString, Int32 maxDays, Boolean useDefaultRoute, BlobContainerPublicAccessType accessType)
   at Our.Umbraco.FileSystemProviders.Azure.AzureFileSystem.GetInstance(String containerName, String rootUrl, String connectionString, String maxDays, String useDefaultRoute, String usePrivateContainer)
   at Our.Umbraco.FileSystemProviders.Azure.AzureBlobFileSystem..ctor(String containerName, String rootUrl, String connectionString, String maxDays, String useDefaultRoute)
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
   at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at Umbraco.Core.IO.FileSystemProviderManager.GetUnderlyingFileSystemNoCache(String alias, Func`1 fallback)
   at Umbraco.Core.IO.FileSystemProviderManager.<>c__DisplayClass53_0`1.<GetFileSystemProvider>b__0(String _)
   at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
   at Umbraco.Core.IO.FileSystemProviderManager.GetFileSystemProvider[TFileSystem](Func`1 fallback)
   at Umbraco.Core.IO.FileSystemProviderManager.CreateWellKnownFileSystems()
   at Umbraco.Core.IO.FileSystemProviderManager..ctor()
   at Umbraco.Core.IO.FileSystemProviderManager.get_Current()
   at Our.Umbraco.FileSystemProviders.Azure.VirtualPathProviderController.ApplicationStarting(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
   at Umbraco.Core.ApplicationEventHandler.OnApplicationStarting(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
   at Umbraco.Core.CoreBootManager.<Startup>b__37_0(IApplicationEventHandler x)