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D365 Error converting attribute value to Property

 You are getting this error into your plugin 

Unable to cast object of type 'System.Guid' to type 'Microsoft.Xrm.Sdk.EntityReference'

Your crud operation Entity field has a Lookup field relationship and it is expecting EntityReference.

 EntityReference conactEntityReference = new EntityReference  
         {  
           Id = newContactEntity.Id,  
           LogicalName = Contact.EntityLogicalName  
         };  
         localContext.OrganizationService.Update(new Entity(proevt_eventregistration.EntityLogicalName, inputEventseriesEntity.Id) { ["proevt_contactid"] = conactEntityReference });


 

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