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Retail POS: Could not load all external service modules - event log implicates "Microsoft.Dynamics.Retail.Pos.Contracts.BusinessLogic.IBusinessLogic"

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Hello, 

I run into the dreaded  "Error number: 1300 could not load all external service modules" and then it follows with "Error Number 2: A system error has occurred. the application will close."

I found that the TestConnector.dll was not in the Connectors folder so i copied it from the client directory.  Still no go.

When I check the event log, the issues revolve around "Microsoft.Dynamics.Retail.Pos.Contracts.BusinessLogic.IBusinessLogic"

This is what I get in one of the event log:

SystemCore: System.ComponentModel.Composition.ChangeRejectedException: The composition remains unchanged. The changes were rejected because of the following error(s): The composition produced a single composition error. The root cause is provided below. Review the CompositionException.Errors property for more detailed information. 1) No exports were found that match the constraint: ContractName Microsoft.Dynamics.Retail.Pos.Contracts.BusinessLogic.IBusinessLogic RequiredTypeIdentity Microsoft.Dynamics.Retail.Pos.Contracts.BusinessLogic.IBusinessLogic Resulting in: Cannot set import 'Microsoft.Dynamics.Retail.Pos.SystemCore.PosApplication.BusinessLogic (ContractName="Microsoft.Dynamics.Retail.Pos.Contracts.BusinessLogic.IBusinessLogic")' on part 'Microsoft.Dynamics.Retail.Pos.SystemCore.PosApplication'. Element: Microsoft.Dynamics.Retail.Pos.SystemCore.PosApplication.BusinessLogic (ContractName="Microsoft.Dynamics.Retail.Pos.Contracts.BusinessLogic.IBusinessLogic") --> Microsoft.Dynamics.Retail.Pos.SystemCore.PosApplication at System.ComponentModel.Composition.CompositionResult.ThrowOnErrors(AtomicComposition atomicComposition) at System.ComponentModel.Composition.Hosting.ComposablePartExportProvider.Compose(CompositionBatch batch) at System.ComponentModel.Composition.Hosting.CompositionContainer.Compose(CompositionBatch batch) at System.ComponentModel.Composition.AttributedModelServices.ComposeParts(CompositionContainer container, Object[] attributedParts) at Microsoft.Dynamics.Retail.Pos.SystemCore.PosApplication.Initialize().

Any suggestions are greatly appreciated. 

thanks!

 


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