Salesforce Soap API on VB .NET: Attribute cannot be applied multiple times - vb.net

Question

I'm using Visual Studio 2019 to make a VB .NET to make a WPF application for windows. I'm trying to use the Salesforce SOAP api to grab data from it. In the solution explorer I right click on my project -> Add -> Service Reference -> advanced -> add web reference. I put in the link to the enterprise WSDL file I downloaded from Salesforce. In my project I have a simple test button setup that runs this to try and login:
Dim SFService = New SFAPI.SforceService
Dim loginResult = New SFAPI.LoginResult
loginResult = SFService.login(userID, userPass)
My issue is that I get some errors stating that the autogenerated References.vb has errors and they are as follows:
Error BC30663 Attribute 'GeneratedCodeAttribute' cannot be applied multiple times.
Error BC30663 Attribute 'SerializableAttribute' cannot be applied multiple times.
Error BC30663 Attribute 'DebuggerStepThroughAttribute' cannot be applied multiple times.
Error BC30663 Attribute 'DesignerCategoryAttribute' cannot be applied multiple times.
Error BC30663 Attribute 'XmlTypeAttribute' cannot be applied multiple times.
Warning Custom tool warning: Schema could not be validated. Class generation may fail or may produce incorrect results
Warning Custom tool warning: Schema validation error: Schema item 'simpleType' named 'FaultCode' from namespace 'urn:fault.enterprise.soap.sforce.com' is invalid. The Enumeration constraining facet is invalid - 'fns' is an undeclared prefix.
Warning Custom tool warning: Schema validation error: Schema item 'simpleType' named 'FaultCode' from namespace 'urn:fault.enterprise.soap.sforce.com' is invalid. The Enumeration constraining facet is invalid - 'fns' is an undeclared prefix.
Any help would be greatly appreciated. Thank you!!

Answer 1

In cases where you get errors related to an attribute being applied twice, this usually means that there is a duplicate vb file somewhere. Best thing to do is to hit the icon in your solution explorer to show all files: . There's probably a file being hidden/causing a duplicate here.
Ultimately, there's duplicate attributes being seen by the compiler, which is a failure, unless you specifically allow duplicate attributes.