Clicking the paypal express payment link leads to the following errors, but paypal standard is working fine. This has occurred after moving to a new server, but may have started after upgrade to 1.38a. Any ideas as to what to do to fix this? I have disabled express for the moment until I can solve this.

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in /home/xxxxxx/public_html/store/includes/modules/payment/paypalwpp.php on line 1467

Warning: array_merge() [function.array-merge]: Argument #2 is not an array in /home/xxxxxx/public_html/store/includes/modules/payment/paypalwpp.php on line 1467

Warning: Cannot modify header information - headers already sent by (output started at /home/xxxxxx/public_html/store/includes/modules/payment/paypalwpp.php:1467) in /home/xxxxxx/public_html/store/includes/modules/payment/paypalwpp.php on line 1492

Warning: Cannot modify header information - headers already sent by (output started at /home/xxxxxx/public_html/store/includes/modules/payment/paypalwpp.php:1467) in /home/xxxxxx/public_html/store/includes/functions/functions_general.php on line 44

Thank you