Import of CRM 2015 Org in CRM 2016

Hi,

I am trying to import a CRM 2015 Org in CRM 2016 and keep getting the following error.

Any suggestions would be welcome.

Thanks

Error| Exception occured during Microsoft.Crm.Tools.Admin.OrganizationUpgrader: Error.ActionFailed Microsoft.Crm.Tools.Admin.UpgradeDatabaseAction
InnerException:
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> Microsoft.Crm.CrmException: Error installing sp with name=p_DeleteAttributeFromIndexById
Must declare the scalar variable "@indexId". ---> System.Data.SqlClient.SqlException: Must declare the scalar variable "@indexId".
   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
   at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
   at System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean async, Int32 timeout, Boolean asyncWrite)
   at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean asyncWrite)
   at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
   at Microsoft.Crm.CrmDbConnection.InternalExecuteWithRetry[TResult](Func`1 ExecuteMethod, IDbCommand command)
   at Microsoft.Crm.CrmDbConnection.InternalExecuteNonQuery(IDbCommand command, Boolean capturePerfTrace)
   at Microsoft.Crm.Metadata.SqlHelper.ExecuteBatches(IDbCommand sqlCommand, String sqlScript)
   at Microsoft.Crm.Setup.StoredProcedureService.InstallStoredProcedureInternal(StoredProcedureData spData, SqlExecutionContext sqlContext)
   --- End of inner exception stack trace ---