Kentico There is already an open DataReader associated with this Command which must be closed first.

System.InvalidOperationException: There is already an open DataReader associated with this Command which must be closed first.
at System.Data.SqlClient.SqlInternalConnectionTds.ValidateConnectionForExecute(SqlCommand command)
at System.Data.SqlClient.SqlCommand.ValidateCommand(String method, Boolean async)
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry)
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
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 CMS.DataEngine.AbstractDataConnection.ExecuteQuery(String queryText, QueryDataParameters queryParams, QueryTypeEnum queryType, Boolean requiresTransaction)
at CMS.DataEngine.GeneralConnection.RunQuery(QueryParameters query)
at CMS.DataEngine.GeneralConnection.RunQueryWithRetry(QueryParameters query, Int32 retryCount)
at CMS.DataEngine.GeneralConnection.ExecuteQuery(QueryParameters query, Int32& totalRecords)
at CMS.DataEngine.DataQueryBase`1.GetDataFromDBInternal()
at CMS.DataEngine.DataQueryBase`1.GetDataFromDB()
at CMS.DataEngine.DataQueryBase`1.GetData()
at CMS.DataEngine.DataQueryBase`1.get_Result()
at CMS.DataEngine.ObjectQueryBase`2.GetResults(IDataQuery query, Int32& totalRecords)
at CMS.DataEngine.DataQueryBase`1.GetDataFromDB()
at CMS.DataEngine.DataQueryBase`1.GetData()
at CMS.DataEngine.ObjectQueryBase`2.GetData()
at CMS.DataEngine.DataQueryBase`1.get_Result()
at CMS.DataEngine.ObjectQueryBase`2.EnsureTypedResult()
at CMS.DataEngine.ObjectQueryBase`2.System.Collections.IEnumerable.GetEnumerator()
at CMS.DataEngine.EnumerableWrapper`1.-GetEnumerator>d__5.MoveNext()
at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source)
at System.Linq.EnumerableExecutor`1.ExecuteBoxed()
at CMS.DataEngine.CMSQueryProvider`1.Execute[TResult](Expression expression)
at CMS.DataEngine.AbstractInfoProvider`3.GetInfoByFullNameInternal(String fullName)
at CMS.DataEngine.AbstractInfoProvider`3.GetInfoByFullName(String fullName, Boolean useHashtable)
at CMS.DataEngine.QueryInfoProvider.GetQueryInfoInternal(String queryName)
at CMS.DataEngine.QueryInfoProvider.GetQueryInfo(String name, Boolean throwException)
at CMS.DataEngine.QueryInfoProvider.QueryIsExplicitlyDefined(String className, String queryName)
at CMS.DataEngine.SimpleDataClass.Insert(Boolean initId)
at CMS.DataEngine.AbstractInfoBase`1.InsertData()
at CMS.CustomTables.CustomTableItem.InsertData()
at CMS.DataEngine.AbstractInfoProvider`3.SetInfo(TInfo info)

It seems that your using your own custom table they set up: Managing custom tables and are trying to use the insert method from the API: Custom table data.

Can you debug the code to see if it's your custom code that is throwing the error? And If you are creating multiple threads in the code, I've seen examples such as new CMSThread(() => { Sender … }) and Task.Factory.StartNew(CMSThread.Wrap(() =>{// Custom code...})); solved it for previous customer with this error.

Custom code review falls outside of regular Kentico maintenance. If you need assistance with your custom implementation or would like a hands-on review of best practices, I recommend that you consider our paid Consulting services. Kentico Solution Architects will be able to offer you 1-on-1 assistance with detailed explanations.

按照这个修改

 Task.Factory.StartNew(CMSThread.Wrap(() =>
                    {
                      //Custom code
                    }));

https://docs.xperience.io/k12sp/installation/hotfix-instructions-kentico-12

12.0.73

• API – After applying the hotfix, the static contexts in the Kentico API, such as SiteContext, ContactManagementContext, or CMSActionContext persist their values within custom asynchronous code (async methods). The changes may in certain cases cause incorrect behavior or exceptions when using the TaskFactory API in custom code. To avoid the issues, enclose the code within an additional call of the CMSThread.Wrap method:

   

using CMS.Base;

Task.Factory.StartNew(CMSThread.Wrap(() =>
{
    // Custom code
    ...
}));