[Win32Exception (0x80004005): The system cannot find the file specified]

[SqlException (0x80131904): A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)]
   System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection) +347
   System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) +78
   System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection) +191
   System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) +154
   System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) +21
   System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry) +90
   System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry) +217
   System.Data.SqlClient.SqlConnection.Open() +96
   Sampa.Library.GeneralLib.PublicSqlMethods.GetDataTable(String selectCommand, String connectionString, List`1 parameters) +162
   Sampa.Library.GeneralLib.BusinessObject.FetchObject(String selectQuery, List`1 parameters) +245
   Sampa.RLALibrary.CMSLib.CMSPage.FetchObject(ArrayList menuPath, Int32 lcid, Int32 subdomainId) +424
   Sampa.RLALibrary.CMSLib.CMSPage.GetCMSPage(ArrayList menuPath, Int32 lcid, Int32 subdomainId, Boolean loadChild, String connectionString) +40
   Sampa.Library.GeneralLib.CustomPage.get_CurrentCMSPage() +234
   Sampa.Library.GeneralLib.CustomPage.get_CacheEnabled() +24
   Sampa.Library.GeneralLib.CustomPage.get_CachedContent() +45
   Sampa.Web.View.GeneralUI.ContentPage.Page_Load(Object sender, EventArgs e) +567
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
   System.Web.UI.Control.OnLoad(EventArgs e) +95
   System.Web.UI.Adapters.ControlAdapter.OnLoad(EventArgs e) +14
   System.Web.UI.Control.LoadRecursive() +9798291
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +678