Cannot succesvol create PHP API script

[ITI]

Thanx for your quick response.

After a day search I saw a another warning: "[2026-02-19 10:37:12] WARNING: (400) Field validation failure;...

[ITI]

I follow this tutorial but get direct errors.
https://docs.espocrm.com/development/api-client-php/

After the command " composer...