Symptoms

Salesforce Contact SmartObject error
After creating the Salesforce service instance, I try to run the "Get single Contact" method of the Contact object and get the below error:

WSDL path and name invalid.

Service: Salesforce
Service Guid:
Severity: Error
 

Diagnoses

The error was caused by having spaces or special characters in the WSDL and SalesForce generated DLLs path.
 

Resolution

Placing the WSDL and the SaledForce generated DLLs in the Path with no spaces or special character during registering Salesforce Service Instance resolved the issue.