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When trying to log into the API Version 45 in Production environment I am receiving the following error.
UNKNOWN ERROR: SOAP-ERROR: Parsing WSDL: Couldn't load from 'soapclient/sforce.450.partner.wsdl' : failed to load external entity "soapclient/sforce.450.partner.wsdl
Version 45 corresponds to Spring '19, it was not available in production on the moment when this question was opened, but should be available now, since all the production organizations should have already migrated to Spring '19.
