Confirm Checkout error

I have configured a Market Press instance and everything is working except for when I am purchasing a product. I can check out using my shopping cart and it leads me to Pay Pal and then comes back to the Market Press site to the "confirm checkout" page. When I hit the "confirm payment" button I get the following error...
There was a problem finalizing your purchase with PayPal. Please go back and try again.

10445 - This transaction cannot be processed at this time. Please try again later. - This transaction cannot be processed at this time. Please try again later.

There is also text at the top of the page (bunch of warnings printed to the screen) see below

Warning: Missing argument 3 for MP_Gateway_Paypal_Express::smiley:oExpressCheckoutPayment(), called in /var/www/vhosts/mywebsite.com.au/subdomains/shop/httpdocs/wp-content/plugins/marketpress/marketpress-includes/plugins-gateway/paypal-express.php on line 333 and defined in /var/www/vhosts/mywebsite.com.au/subdomains/shop/httpdocs/wp-content/plugins/marketpress/marketpress-includes/plugins-gateway/paypal-express.php on line 1046

Warning: Missing argument 4 for MP_Gateway_Paypal_Express::smiley:oExpressCheckoutPayment(), called in /var/www/vhosts/mywebsite.com.au/subdomains/shop/httpdocs/wp-content/plugins/marketpress/marketpress-includes/plugins-gateway/paypal-express.php on line 333 and defined in /var/www/vhosts/mywebsite.com.au/subdomains/shop/httpdocs/wp-content/plugins/marketpress/marketpress-includes/plugins-gateway/paypal-express.php on line 1046

Warning: Missing argument 5 for MP_Gateway_Paypal_Express::smiley:oExpressCheckoutPayment(), called in /var/www/vhosts/mywebsite.com.au/subdomains/shop/httpdocs/wp-content/plugins/marketpress/marketpress-includes/plugins-gateway/paypal-express.php on line 333 and defined in /var/www/vhosts/mywebsite.com.au/subdomains/shop/httpdocs/wp-content/plugins/marketpress/marketpress-includes/plugins-gateway/paypal-express.php on line 1046

Warning: Missing argument 6 for MP_Gateway_Paypal_Express::smiley:oExpressCheckoutPayment(), called in /var/www/vhosts/mywebsite.com.au/subdomains/shop/httpdocs/wp-content/plugins/marketpress/marketpress-includes/plugins-gateway/paypal-express.php on line 333 and defined in /var/www/vhosts/mywebsite.com.au/subdomains/shop/httpdocs/wp-content/plugins/marketpress/marketpress-includes/plugins-gateway/paypal-express.php on line 1046
string(1222) "&TOKEN=EC-5RB87058PV5642739&PAYERID=88KC8QLDM3FKY&PAYMENTREQUEST_0_SELLERID=1&PAYMENTREQUEST_0_SELLERPAYPALACCOUNTID=&PAYMENTREQUEST_0_PAYMENTACTION=Sale&PAYMENTREQUEST_0_CURRENCYCODE=AUD&PAYMENTREQUEST_0_NOTIFYURL=http://shop.mywebsite.com.au/store/payment-return/paypal-express&PAYMENTREQUEST_0_SHIPTONAME=Me
Me+Me
Me
Me&PAYMENTREQUEST_0_SHIPTOSTREET=123+Street&PAYMENTREQUEST_0_SHIPTOSTREET2=&PAYMENTREQUEST_0_SHIPTOCITY=Toowoomba&PAYMENTREQUEST_0_SHIPTOSTATE=QLD&PAYMENTREQUEST_0_SHIPTOCOUNTRYCODE=AU&PAYMENTREQUEST_0_SHIPTOZIP=4350&PAYMENTREQUEST_0_SHIPTOPHONENUM=&L_PAYMENTREQUEST_0_NAME0=101+Advanced+Positions+for+Lovers&L_PAYMENTREQUEST_0_AMT0=22.68&L_PAYMENTREQUEST_0_NUMBER0=&L_PAYMENTREQUEST_0_QTY0=2&L_PAYMENTREQUEST_0_ITEMURL0=http%3A%2F%2Fshop.mywebsite.com.au%2Fstore%2Fproducts%2F101-advanced-sexual-positions-for-lovers-3%2F&L_PAYMENTREQUEST_0_ITEMCATEGORY0=Physical&PAYMENTREQUEST_0_ITEMAMT=45.36&PAYMENTREQUEST_0_SHIPPINGAMT=0.02&PAYMENTREQUEST_0_TAXAMT=4.54&PAYMENTREQUEST_0_DESC=+Store+Purchase+-+Order+ID%3A+174a99417efe&PAYMENTREQUEST_0_AMT=49.92&PAYMENTREQUEST_0_INVNUM=174a99417efe&PAYMENTREQUEST_0_PAYMENTREQUESTID=1:174a99417efe&PAYMENTREQUEST_0_ALLOWEDPAYMENTMETHOD=InstantPaymentOnly"