我使用 Hangfire 创建了一个 RecurringJob，但是当作业完成时，我收到以下错误：
ERROR 2018-12-05 15:20:05,982 [fc937] Hangfire.AutomaticRetryAttribute - Failed to process the job '81': an exception occurred.
System.InvalidOperationException: This MySqlConnection is already in use. See https://fl.vu/mysql-conn-reuse
at MySqlConnector.Core.ServerSession.StartQuerying(MySqlCommand command) in C:\projects\mysqlconnector\src\MySqlConnector\Core\ServerSession.cs:line 149
at MySqlConnector.Core.TextCommandExecutor.ExecuteReaderAsync(String commandText, MySqlParameterCollection parameterCollection, CommandBehavior behavior, IOBehavior ioBehavior, CancellationToken cancellationToken) in C:\projects\mysqlconnector\src\MySqlConnector\Core\TextCommandExecutor.cs:line 33
at MySql.Data.MySqlClient.MySqlCommand.ExecuteNonQueryAsync(IOBehavior ioBehavior, CancellationToken cancellationToken) in C:\projects\mysqlconnector\src\MySqlConnector\MySql.Data.MySqlClient\MySqlCommand.cs:line 261
at MySql.Data.MySqlClient.MySqlTransaction.CommitAsync(IOBehavior ioBehavior, CancellationToken cancellationToken) in C:\projects\mysqlconnector\src\MySqlConnector\MySql.Data.MySqlClient\MySqlTransaction.cs:line 25
at MySql.Data.MySqlClient.MySqlTransaction.Commit() in C:\projects\mysqlconnector\src\MySqlConnector\MySql.Data.MySqlClient\MySqlTransaction.cs:line 12
at Microsoft.EntityFrameworkCore.Storage.RelationalTransaction.Commit()
at Abp.EntityFrameworkCore.Uow.DbContextEfCoreTransactionStrategy.Commit() in D:\Github\aspnetboilerplate\src\Abp.EntityFrameworkCore\EntityFrameworkCore\Uow\DbContextEfCoreTransactionStrategy.cs:line 66
at Abp.EntityFrameworkCore.Uow.EfCoreUnitOfWork.CommitTransaction() in D:\Github\aspnetboilerplate\src\Abp.EntityFrameworkCore\EntityFrameworkCore\Uow\EfCoreUnitOfWork.cs:line …