Web Part Error: Unable to load assembly group. The user assembly group provider threw an exception while trying to provide user assemblies for the specified assembly group. Correlation ID: db49a29f-efba-30f5-b01b-26f54260533f.

Error Details:
[SPUserCodeExecutionPipelineFailedException: Unable to load assembly group. The user assembly group provider threw an exception while trying to provide user assemblies for the specified assembly group.]
 
 Server stack trace:
  at Microsoft.SharePoint.UserCode.SPUserCodeAssemblyCacheManager.EnsureUserCodeAssemblyGroupIsCached(Guid siteId, SPUserCodeAssemblyGroupId userCodeAssemblyGroupId)
  at Microsoft.SharePoint.UserCode.SPUserCodeExecutionHost.Execute(Type userCodeWrapperType, Guid siteCollectionId, SPUserToken userToken, String affinity, SPUserCodeExecutionContext executionContext)
  at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs)
  at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg)
 
 Exception rethrown at [0]:
  at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
  at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
  at Microsoft.SharePoint.Administration.ISPUserCodeExecutionHostProxy.Execute(Type userCodeWrapperType, Guid siteCollectionId, SPUserToken userToken, String affinityBucketName, SPUserCodeExecutionContext executionContext)
  at Microsoft.SharePoint.UserCode.SPUserCodeExecutionManager.Execute(Type userCodeWrapperType, SPSite site, SPUserCodeExecutionContext executionContext, SPUserCodeActivationSiteInfo activationSite)
  at Microsoft.SharePoint.UserCode.SPUserCodeExecutionManager.Execute(Type userCodeWrapperType, SPSite site, SPUserCodeExecutionContext executionContext)
  at Microsoft.SharePoint.UserCode.SPUserCodeWebPartRemoteExecutionHelper.<>c__DisplayClassa.b__9()
  at Microsoft.SharePoint.Utilities.SecurityContext.RunAsProcess(CodeToRunElevated secureCode)
  at Microsoft.SharePoint.UserCode.SPUserCodeWebPartRemoteExecutionHelper.ExecuteRequestInSandBox(HttpContext context, SPWeb web, SPWebPartManager manager, SPUserCodeWebPart userCodeWebPart)

[SqlException: The target principal name is incorrect. Cannot generate SSPI context.]
  at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)
  at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)
  at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)
  at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
  at System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry)
  at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)
  at System.Data.SqlClient.SqlConnection.Open()
  at Microsoft.SharePoint.Utilities.SqlSession.OpenConnection()
  at Microsoft.SharePoint.Utilities.SqlSession.ExecuteReader(SqlCommand command, CommandBehavior behavior, SqlQueryData monitoringData, Boolean retryForDeadLock)
  at Microsoft.SharePoint.Utilities.SqlSession.ExecuteReader(SqlCommand command, CommandBehavior behavior)
  at Microsoft.SharePoint.Administration.SPConfigurationDatabase.FetchId(QualifiedObjectName qName)
  at Microsoft.SharePoint.Administration.SPConfigurationDatabase.GetObject(String name, Guid parentId, Type type)
  at Microsoft.SharePoint.Administration.SPConfigurationDatabase.Microsoft.SharePoint.Administration.ISPPersistedStoreProvider.GetObject(String name, Guid parentId, Type type)
  at Microsoft.SharePoint.Administration.SPPersistedObject.GetChild[T](String name)
  at Microsoft.SharePoint.Administration.SPUsageDefinition.GetLocal[T]()
  at Microsoft.SharePoint.Utilities.SPSqlExceptionsMonitor.get_Enabled()
  at Microsoft.SharePoint.Utilities.SPSqlExceptionsMonitor.ReportException(String connection, Int32 exceptionNumber)
  at Microsoft.SharePoint.Utilities.SqlSession.OpenConnection()
  at Microsoft.SharePoint.Utilities.SqlSession.ExecuteReader(SqlCommand command, CommandBehavior behavior, SqlQueryData monitoringData, Boolean retryForDeadLock)
  at Microsoft.SharePoint.Utilities.SqlSession.ExecuteReader(SqlCommand command, CommandBehavior behavior)
  at Microsoft.SharePoint.Administration.SPConfigurationDatabase.FetchId(QualifiedObjectName qName)
  at Microsoft.SharePoint.Administration.SPConfigurationDatabase.GetObject(String name, Guid parentId, Type type)
  at Microsoft.SharePoint.Administration.Claims.SPClaimProviderManager.get_Local()
  at Microsoft.SharePoint.SPSite.InitUserToken(SPRequest request)
  at Microsoft.SharePoint.SPSite.SPSiteConstructor(SPFarm farm, Guid applicationId, Guid contentDatabaseId, Guid siteId, Guid siteSubscriptionId, SPUrlZone zone, Uri requestUri, String serverRelativeUrl, Boolean hostHeaderIsSiteName, SPUserToken userToken, Boolean appWebRequest, String appHostHeaderRedirectDomain, String appSiteDomainPrefix, String subscriptionName, String appSiteDomainId, Uri primaryUri)
  at Microsoft.SharePoint.SPSite..ctor(Guid id, SPFarm farm, SPUrlZone zone, SPUserToken userToken)
  at Microsoft.SharePoint.Administration.SPSolutionLanguagePack.GetSolutionInfoFromGallery(Guid siteId, Guid solutionId, String solutionHash, String& fileName, String& hash, Byte[]& fileBytes)
  at Microsoft.SharePoint.UserCode.SPUserCodeLightweightSolutionAssemblyGroupProvider.GetAssembliesInGroup(Guid siteId, String assemblyGroupId)
  at Microsoft.SharePoint.UserCode.SPUserCodeAssemblyCacheManager.EnsureUserCodeAssemblyGroupIsCached(Guid siteId, SPUserCodeAssemblyGroupId userCodeAssemblyGroupId)


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Web Part Error: Unable to load assembly group. The user assembly group provider threw an exception while trying to provide user assemblies for the specified assembly group. Correlation ID: db49a29f-efba-30f5-b01b-26f54260533f.

Error Details:
[SPUserCodeExecutionPipelineFailedException: Unable to load assembly group. The user assembly group provider threw an exception while trying to provide user assemblies for the specified assembly group.]
 
 Server stack trace:
  at Microsoft.SharePoint.UserCode.SPUserCodeAssemblyCacheManager.EnsureUserCodeAssemblyGroupIsCached(Guid siteId, SPUserCodeAssemblyGroupId userCodeAssemblyGroupId)
  at Microsoft.SharePoint.UserCode.SPUserCodeExecutionHost.Execute(Type userCodeWrapperType, Guid siteCollectionId, SPUserToken userToken, String affinity, SPUserCodeExecutionContext executionContext)
  at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs)
  at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg)
 
 Exception rethrown at [0]:
  at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
  at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
  at Microsoft.SharePoint.Administration.ISPUserCodeExecutionHostProxy.Execute(Type userCodeWrapperType, Guid siteCollectionId, SPUserToken userToken, String affinityBucketName, SPUserCodeExecutionContext executionContext)
  at Microsoft.SharePoint.UserCode.SPUserCodeExecutionManager.Execute(Type userCodeWrapperType, SPSite site, SPUserCodeExecutionContext executionContext, SPUserCodeActivationSiteInfo activationSite)
  at Microsoft.SharePoint.UserCode.SPUserCodeExecutionManager.Execute(Type userCodeWrapperType, SPSite site, SPUserCodeExecutionContext executionContext)
  at Microsoft.SharePoint.UserCode.SPUserCodeWebPartRemoteExecutionHelper.<>c__DisplayClassa.b__9()
  at Microsoft.SharePoint.Utilities.SecurityContext.RunAsProcess(CodeToRunElevated secureCode)
  at Microsoft.SharePoint.UserCode.SPUserCodeWebPartRemoteExecutionHelper.ExecuteRequestInSandBox(HttpContext context, SPWeb web, SPWebPartManager manager, SPUserCodeWebPart userCodeWebPart)

[SqlException: The target principal name is incorrect. Cannot generate SSPI context.]
  at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)
  at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)
  at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)
  at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
  at System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry)
  at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)
  at System.Data.SqlClient.SqlConnection.Open()
  at Microsoft.SharePoint.Utilities.SqlSession.OpenConnection()
  at Microsoft.SharePoint.Utilities.SqlSession.ExecuteReader(SqlCommand command, CommandBehavior behavior, SqlQueryData monitoringData, Boolean retryForDeadLock)
  at Microsoft.SharePoint.Utilities.SqlSession.ExecuteReader(SqlCommand command, CommandBehavior behavior)
  at Microsoft.SharePoint.Administration.SPConfigurationDatabase.FetchId(QualifiedObjectName qName)
  at Microsoft.SharePoint.Administration.SPConfigurationDatabase.GetObject(String name, Guid parentId, Type type)
  at Microsoft.SharePoint.Administration.SPConfigurationDatabase.Microsoft.SharePoint.Administration.ISPPersistedStoreProvider.GetObject(String name, Guid parentId, Type type)
  at Microsoft.SharePoint.Administration.SPPersistedObject.GetChild[T](String name)
  at Microsoft.SharePoint.Administration.SPUsageDefinition.GetLocal[T]()
  at Microsoft.SharePoint.Utilities.SPSqlExceptionsMonitor.get_Enabled()
  at Microsoft.SharePoint.Utilities.SPSqlExceptionsMonitor.ReportException(String connection, Int32 exceptionNumber)
  at Microsoft.SharePoint.Utilities.SqlSession.OpenConnection()
  at Microsoft.SharePoint.Utilities.SqlSession.ExecuteReader(SqlCommand command, CommandBehavior behavior, SqlQueryData monitoringData, Boolean retryForDeadLock)
  at Microsoft.SharePoint.Utilities.SqlSession.ExecuteReader(SqlCommand command, CommandBehavior behavior)
  at Microsoft.SharePoint.Administration.SPConfigurationDatabase.FetchId(QualifiedObjectName qName)
  at Microsoft.SharePoint.Administration.SPConfigurationDatabase.GetObject(String name, Guid parentId, Type type)
  at Microsoft.SharePoint.Administration.Claims.SPClaimProviderManager.get_Local()
  at Microsoft.SharePoint.SPSite.InitUserToken(SPRequest request)
  at Microsoft.SharePoint.SPSite.SPSiteConstructor(SPFarm farm, Guid applicationId, Guid contentDatabaseId, Guid siteId, Guid siteSubscriptionId, SPUrlZone zone, Uri requestUri, String serverRelativeUrl, Boolean hostHeaderIsSiteName, SPUserToken userToken, Boolean appWebRequest, String appHostHeaderRedirectDomain, String appSiteDomainPrefix, String subscriptionName, String appSiteDomainId, Uri primaryUri)
  at Microsoft.SharePoint.SPSite..ctor(Guid id, SPFarm farm, SPUrlZone zone, SPUserToken userToken)
  at Microsoft.SharePoint.Administration.SPSolutionLanguagePack.GetSolutionInfoFromGallery(Guid siteId, Guid solutionId, String solutionHash, String& fileName, String& hash, Byte[]& fileBytes)
  at Microsoft.SharePoint.UserCode.SPUserCodeLightweightSolutionAssemblyGroupProvider.GetAssembliesInGroup(Guid siteId, String assemblyGroupId)
  at Microsoft.SharePoint.UserCode.SPUserCodeAssemblyCacheManager.EnsureUserCodeAssemblyGroupIsCached(Guid siteId, SPUserCodeAssemblyGroupId userCodeAssemblyGroupId)
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