Help! My site is https://crafttabby.com. I am trying to setup PayPal on the installed WooCommerce platform but the "Things don't appear to be working at the moment" keeps appearing. I have checked out https://www.paypal-knowledge.com/infocenter/index?page=content&id=FAQ2067 but can't figure what the anomaly is. Help please!

The last log error is:

2017-08-11T[Redacted time] INFO Generating payment form for order 68045. Notify URL: https://crafttabby.com/wc-api/WC_Gateway_Paypal/
2017-08-11T[Redacted time] INFO PayPal Request Args for order 68045: cmd=_cart&business=hello%40crafttabby.com&no_note=1&currency_code=USD&charset=utf-8&rm=2&upload=1&return=https%3A%2F%2Fcrafttabby.com%2Fcheckout%2Forder-received%2F68045%3Fkey%3Dwc_order_598db30d35dc1%26utm_nooverride%3D1&cancel_return=https%3A%2F%2Fcrafttabby.com%2Fcart%2F%3Fcancel_order%3Dtrue%26order%3Dwc_order_598db30d35dc1%26order_id%3D68045%26redirect%26_wpnonce%3D2cb54076ff&page_style=&image_url=&paymentaction=sale&bn=WooThemes_Cart&invoice=WC-68045&custom=%7B%22order_id%22%3A68045%2C%22order_key%22%3A%22wc_order_598db30d35dc1%22%7D&notify_url=https%3A%2F%2Fcrafttabby.com%2Fwc-api%2FWC_Gateway_Paypal%2F&first_name=REDACTED&last_name=REDACTED&address1=REDACTED&address2=REDACTED&city=REDACTED&state=&zip=REDACTED&country=SG&email=REDACTED&night_phone_b=REDACTED&no_shipping=1&tax_cart=0.00&item_name_1=Torii+Gate&quantity_1=1&amount_1=27.00&item_number_1=CT-KIT-1&lc=en