How to resolve network error 61 when sending an email with SIM800C module using AT commands

Hello, I want to send an email using AT commands from a SIM800C module with the Free operator. When executing the AT+SMTPSEND command, I get error number 61: (Network error). The commands for creating the email and configuring the server are all validated. This module is also used to send SMS and I have no difficulties with that part. Should I change a setting, and if so, which one, or is this an incompatibility related to the operator? Thank you
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