Hello @Bhargava-MSFT , thank you for your reply.I'm not using a schema while importing the data on the data flow, neither on the dataset. Even when i try to import the schema from the "Projection" tab i have the same error
About the other suggestion i don't think that the firewalls could be a problem because the copy data activities are running correctly and the test connections of Linked service and dataset run successfully.
It would be very helpful if you had any other ideas.
Thank you in advance!