This defect was reported a while ago: DNN-10717, and has been subsequently closed, but as far as I can tell, it is still a major problem.
In summary, it is impossible to use the "Create New Module" option to automatically import 2 ascx controls from the same directory. The system has been reporting the same SQL error through a number of DNN releases. The workaround is to place them all in seperate directories, but this is burdensome.
Message: System.Data.SqlClient.SqlException (0x80131904): Cannot insert duplicate key row in object 'dbo.Packages' with unique index 'IX_Packages'. The statement has been terminated. at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning() at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) at System.Data.SqlClient.SqlDataReader.ConsumeMetaData() at System.Data.SqlClient.SqlDataReader.get_MetaData() at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async) at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) at System.Data.SqlClient.SqlCommand.ExecuteScalar() at Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteScalar(String connectionString, CommandType commandType, String commandText, SqlParameter[] commandParameters) at Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteScalar(String connectionString, String spName, Object[] parameterValues) at DotNetNuke.Data.SqlDataProvider.AddPackage(Int32 portalID, String name, String friendlyName, String description, String type, String version, String license, String manifest, String owner, String organization, String url, String email, String releaseNotes, Boolean isSystemPackage, Int32 CreatedByUserID) at DotNetNuke.Services.Installer.Packages.PackageController.AddPackage(PackageInfo package, Boolean includeDetail) at DotNetNuke.Services.Installer.Packages.PackageController.SavePackage(PackageInfo package) at DotNetNuke.Modules.Admin.ModuleDefinitions.CreateModuleDefinition.ImportControl(String controlSrc) in
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