Conversion workbench error

There are conversion errors for sequence 1110, 1130 and 1460.

Error log shows
1110 - RunTask:System.Exception: Unable to load assembly Erp.Internal.Conversion.SetPODetailRcvDtlQtyOption.dll for task 375940 or it contained no types that implemented the RunProcess method.
1130 - Unable to load assembly Erp.Internal.Conversion.PMSetVendPartCurrencyCode.dll for task 374208 or it contained no types that implemented the RunProcess method.
1460 - Conversion to fix TaxTran table truncated report ID´s after Vantage migration and set defaults on TaxReport (Fiscal Calendar, IncludeAP and IncludeAR).