E-njoint

Hi All, I am trying to migrate from prestashop 1.6.1.23 to thirty bees. I tried all different settings for the migration proces but I keep running into this error message: [Ajax / Server Error for action prepareDb] textStatus: "parsererror " errorThrown:"SyntaxError: Unexpected token F in JSON at position 0 " jqXHR: " Fatal error: ISO code is not correct " I am now stuck on the migration. Any ideas how to get this done? Help will be appreciated! Thanks!