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

Any Update on this issue ?