Help for Aimeos

Hi aimeos, I need help regarding an issue with the sandbox payment through Paypal. I made a payment in paypal using sandbox, but an error occurs by stopping the transaction by saying "PayPal Express: Request for order ID "17" failed with "Security error"". Screenshot_19...

Hello aimeos,
I'm new in aimeos eCommerce script but i successfully install the script in my live server my shop front end is working finr but
my admin section css is not working i don't know why please anyone help me with this