I am trying to use the ExtractTextInfroFromPdf Abode PDF API but am receiving authentication errors

Hi Guys, 

I am trying to run the ExtractTextInfoFromPdf file that is part Adobe Pdf API, but I am reciving the following error: 

ERROR ExtractTextInfoFromPDF.Program - Exception encountered while executing operation
System.ArgumentException: The ClientId field is required.;The ClientSecret field is required.
at Adobe.PDFServicesSDK.auth.Credentials.Validate()
at Adobe.PDFServicesSDK.auth.ServicePrincipalCredentials..ctor(String clientId, String clientSecret)
at Adobe.PDFServicesSDK.auth.ServicePrincipalCredentials.Builder.Build()
at ExtractTextInfoFromPDF.Program.Main()

The thing though is that I did put my client Id and clientSecret id in the code through these lines  .WithClientId(Environment.GetEnvironmentVariable("sssss"))
.WithClientSecret(Environment.GetEnvironmentVariablessssss"))

Additionally, I ran the 

set PDF_SERVICES_CLIENT_ID=<YOUR CLIENT ID>
set PDF_SERVICES_CLIENT_SECRET=<YOUR CLIENT SECRET>

commands with my given client id and client secret values. I am still facing this issue. Does anyone know how I can fix this issue.