It looks like you are trying different WSDL versions. Your first screen shot shows Year = 2019, Release = 1. Your second shows Year = 2019, Release = 2. Your last error message indicates that you changed it again to Year = 2018, Release = 2. Are you just trying different versions to see if one will work? Does it ever work, or does it fail consistently?
Can you please open the Pipeline Execution Statistics after you run or validate the pipeline, copy the full stack trace from that view and paste it here?
What happens when you click the Validate button on the account itself, rather than running the pipeline using the account?