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I found this KB where shows this message when importing a source, and seems related to a proxy:
Anyway, please, ask this question in the Forum for PowerExchange Adapters, where you might get better answers for PowerExchange for Salesforce.
In that case that you indicate, they did not get to connect to Salesforce, due to a connectivity problem given by the proxy server as initials, but in my case, we can connect, but not make use of the transformations. Anyway, I think your recommendation to change it from the Forum seems very good (I have done so), thank you very much David :-)