Create a lead from PHP API gives an error: 4401Unable to populate data, please check if mandatory value is entered correctly.

Create a lead from PHP API gives an error: 4401Unable to populate data, please check if mandatory value is entered correctly.

Hello,

I'm getting this error:

4401Unable to populate data, please check if mandatory value is entered correctly.

And I'm sure, that i passed all mandatory variables.

This is my query:

https://crm.zoho.com/crm/private/xml/Leads/insertRecords?newFormat=1&authtoken=xxxxxxx&scope=crmapi&xmlData=%3CLeads%3E%3Crow+no%3D%221%22%3E%3CFL+val%3D%22Company%22%3Efsfds%3C%2FFL%3E%3CFL+val%3D%22Email%22%3Edavid%40domain.es%3C%2FFL%3E%3CFL+val%3D%22First_Name%22%3EDavid%3C%2FFL%3E%3CFL+val%3D%22Last_Name%22%3EDavid%3C%2FFL%3E%3CFL+val%3D%22Mobile%22%3E669904426%3C%2FFL%3E%3C%2Frow%3E%3C%2FLeads%3E