Edited Issue: Error while creating new issue (Version. 1.2.231) [87]

I experienced the same issue with an upgrade to
1.2.231.0.

It lies with a stored procedure called "BugNet_IssueNotification_GetIssueNotificationsByIssueId" that is missing the following line:

ISNULL(UP.PreferredLocale, @DefaultCulture) AS NotificationCulture

I updated the stored procedure with the contents from the CREATE PROCEDURE that exists in \BugNET_WAP\Providers\DataProviders\SqlDataProvider\BugNet.Schema.SqlDataProvider.sql.

I suspect the best option would be to create a new database containing a new install of 1.2.231.0 and schema diff with your existing database.