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Error Message: An error occured attempting to execute the command against the database.

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Stack Trace:
Dea.Data.DatabaseException: An error occured attempting to execute the command against the database. ---> System.Data.SqlClient.SqlException: Cannot open database "Master_Calendar" requested by the login. The login failed.
Login failed for user 'MC_User'.
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 System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet)
at Dea.Data.Database.a(DbCommand A_0, DataSet A_1, String[] A_2)
--- End of inner exception stack trace ---
at Dea.Data.Database.a(DbCommand A_0, DataSet A_1, String[] A_2)
at Dea.Data.Database.LoadDataSet(DbCommand command, DataSet dataSet, String[] tableNames)
at Dea.Data.Database.ExecuteDataSet(DbCommand command)
at Dea.MasterCalendar.Events.EventsDatabase.GetEventDetailsData(Int32 eventId, Int32 eventDetailId, Boolean showApprovedUDQsOnly)
at EventDetails.LoadData(String fromPage, Boolean isChild, Boolean isPreview)
at EventDetails.Page_Load(Object sender, EventArgs e)
at System.Web.UI.Control.OnLoad(EventArgs e)
at Dea.Web.Sites.MasterCalendar.BasePage.OnLoad(EventArgs e)
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

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Additional Information
ErrorCaughtBy: EventDetails.aspx
PatchNumber: 201805210
ClientName:
Product:
SqlStatement: dbo.MC_EventDetails_LoadData
@eventDetailId: 63651
@eventId: -1
@userId: -1
@userTemplateId: -1
@siteAdministrator: False
@showApprovedUDQOnly: True