[parsererror] SyntaxError: Unexpected token A in JSON at position 0 #20
Description
Hello,
When I try to sync my user database with a mailjet contact list, I have this message:
[parsererror] SyntaxError: Unexpected token A in JSON at position 0
I'm a little bit lost because I don't really know where to look in order to fix that... do you have any idea ?
I work with symfony 2.8.51
Thank you for your help