我的网络服务器上安装了 Hangfire。它有效。我能够访问hangfire仪表板。
但是今天突然我尝试打开仪表板，当尝试访问http://localhost/hangfire时， 我收到以下错误：
An unhandled exception occurred while processing the request.
SqlException: Invalid column name 'Key'.
System.Data.SqlClient.SqlConnection.OnError(SqlException exception, bool breakConnection, Action<Action> wrapCloseInAction)
Stack Query Cookies Headers
SqlException: Invalid column name 'Key'.
System.Data.SqlClient.SqlConnection.OnError(SqlException exception, bool breakConnection, Action<Action> wrapCloseInAction)
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, bool breakConnection, Action<Action> wrapCloseInAction)
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, bool callerHasConnectionLock, bool asyncClose)
System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, out bool dataReady)
System.Data.SqlClient.SqlDataReader.TryConsumeMetaData()
System.Data.SqlClient.SqlDataReader.get_MetaData()
System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, string resetOptionsString)
System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, bool returnStream, bool async, int timeout, out Task task, bool asyncWrite, SqlDataReader ds)
System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, bool returnStream, TaskCompletionSource<object> completion, int timeout, out Task task, bool asyncWrite, string method)
System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior)
System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior)
Dapper.SqlMapper.ExecuteReaderWithFlagsFallback(IDbCommand cmd, bool wasClosed, CommandBehavior behavior)
Dapper.SqlMapper.QueryMultipleImpl(IDbConnection cnn, ref CommandDefinition command)
Dapper.SqlMapper.QueryMultiple(IDbConnection cnn, string sql, object param, IDbTransaction transaction, Nullable<int> commandTimeout, Nullable<CommandType> commandType)
Hangfire.SqlServer.SqlServerMonitoringApi+<>c__DisplayClass24_0.<GetStatistics>b__0(DbConnection connection)
Hangfire.SqlServer.SqlServerStorage.UseConnection<T>(DbConnection dedicatedConnection, Func<DbConnection, T> func)
Hangfire.SqlServer.SqlServerMonitoringApi.GetStatistics()
System.Lazy<T>.ViaFactory(LazyThreadSafetyMode mode)
System.Lazy<T>.ExecutionAndPublication(LazyHelper executionAndPublication, bool useDefaultConstructor)
System.Lazy<T>.CreateValue()
Hangfire.Dashboard.Pages.HomePage.Execute()
Hangfire.Dashboard.RazorPage.TransformText(string body)
Hangfire.Dashboard.RazorPageDispatcher.Dispatch(DashboardContext context)
Hangfire.Dashboard.AspNetCoreDashboardMiddleware.Invoke(HttpContext httpContext)
Microsoft.AspNetCore.Builder.Extensions.MapMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Builder.RouterMiddleware.Invoke(HttpContext httpContext)
Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context)
Swashbuckle.AspNetCore.SwaggerUI.SwaggerUIIndexMiddleware.Invoke(HttpContext httpContext)
Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext)
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)
由于仪表板是一些内部的 Hangfire 工具 - 我只是不知道如何解决这个问题。由于 sql 是由 Hangfire 安装的，而 Hangfire 是从 nuget 安装的。
有没有人遇到过这个问题？知道如何使hangfire仪表板出现吗？
谢谢你。