I was able to resolve this issue after removing all the unused fields from the mapping.
This error is seen when user has mapped only the errror group and not mapped any of the output groups to the target.
Map at least one output group from the webservice transformation to the target to resolve this error.
for me above solution worked.
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Even i had the same issue. This issue occurs when we have field rule (include/exclude named field) for non-existing fields in the transformations.
We need to make sure that the rule doesn't point to non existing fields.