Paypal integration issue Looks like something is wrong with this site's Paypal configuration

Hi, i am trying to integrate paypal, right now i am using sandbox for testing.

i am getting below error when clicking on Pay button on web portal for customer.
Paypal currency, Company currency, transaction currency all are Euro

Traceback (most recent call last):
  File "apps/frappe/frappe/", line 95, in application
    response = frappe.api.handle()
  File "apps/frappe/frappe/", line 54, in handle
    return frappe.handler.handle()
  File "apps/frappe/frappe/", line 47, in handle
    data = execute_cmd(cmd)
  File "apps/frappe/frappe/", line 85, in execute_cmd
    return, **frappe.form_dict)
  File "apps/frappe/frappe/", line 1622, in call
    return fn(*args, **newargs)
  File "apps/erpnext/erpnext/accounts/doctype/payment_request/", line 486, in make_payment_request
    frappe.local.response["location"] = pr.get_payment_url()
  File "apps/erpnext/erpnext/accounts/doctype/payment_request/", line 207, in get_payment_url
    return controller.get_payment_url(
  File "apps/payments/payments/payment_gateways/doctype/paypal_settings/", line 177, in get_payment_url
    response = self.execute_set_express_checkout(**kwargs)
  File "apps/payments/payments/payment_gateways/doctype/paypal_settings/", line 218, in execute_set_express_checkout
  File "apps/frappe/frappe/", line 534, in throw
  File "apps/frappe/frappe/", line 502, in msgprint
  File "apps/frappe/frappe/", line 451, in _raise_exception
    raise raise_exception(msg)
frappe.exceptions.ValidationError: Looks like something is wrong with this site's Paypal configuration.