getting a generic error "Things don't appear to be working at the moment. Please try again later."

[sorto]

Hello There

I'm getting this generic error :Things don't appear to be working at the moment. Please try again later.; when trying to make payments

I'm using woocommerce and paypal standard plugin to configure api details

Here is the log generated by paypal plugin. there is no error indicated

2021-05-21T17:20:11+00:00 INFO Generating payment form for order 5308. Notify URL: https://theexpressstore.com/wc-api/WC_Gateway_Paypal/

2021-05-21T17:20:11+00:00 INFO PayPal Request Args for order 5308: Array

(

    [cmd] => _cart

    [business] => rsorto@aol.com

    [no_note] => 1

    [currency_code] => USD

    [charset] => utf-8

    [rm] => 2

    [upload] => 1

    [return] => https://theexpressstore.com/checkout/order-received/5308/?key=wc_order_dLj5oXpuJHW8g&utm_nooverride=...

    [cancel_return] => https://theexpressstore.com/cart/?cancel_order=true&order=wc_order_dLj5oXpuJHW8g&order_id=5308&redir...

    [image_url] => 

    [paymentaction] => sale

    [invoice] => WC-5308

    [custom] => {"order_id":5308,"order_key":"wc_order_dLj5oXpuJHW8g"}

    [notify_url] => https://theexpressstore.com/wc-api/WC_Gateway_Paypal/

    [first_name] => ***

    [last_name] => ***

    [address1] => ***

    [address2] => ***

    [city] => ***

    [state] => ***

    [zip] => ***

    [country] => ***

    [email] => ***@***

    [night_phone_a] => ***

    [night_phone_b] => ***

    [night_phone_c] => ***

    [address_override] => 0

    [no_shipping] => 0

    [tax_cart] => 2.80

    [item_name_1] => Light It Up-LED Mirror Makeup Mirror Lights (Color: Two Years Warranty, Emitting Color: 10 Bulbs, Number of Lights: Nature W...

    [quantity_1] => 1

    [amount_1] => 34.99

    [item_number_1] => 32987204580

    [bn] => WooThemes_Cart

)

Please help