vmpsplugin.php Error

[bigfishtools]

I get an error when I checkout on the final page for paypal before it redirects to paypal. I have searched the forum and no solid answer can anyone help? Thanks in advance

Version 1.5.26 Joomla
Version 2.0.2 virtuemart
PHP Version 5.2.17

Error:

Warning: fopen(/home/bigswin/public_html/logs/paypal.log) [function.fopen]: failed to open stream: No such file or directory in /home/bigswin/public_html/administrator/components/com_virtuemart/plugins/vmpsplugin.php on line 940

Warning: fwrite(): supplied argument is not a valid stream resource in /home/bigswin/public_html/administrator/components/com_virtuemart/plugins/vmpsplugin.php on line 941

Warning: fwrite(): supplied argument is not a valid stream resource in /home/bigswin/public_html/administrator/components/com_virtuemart/plugins/vmpsplugin.php on line 942

Warning: fclose(): supplied argument is not a valid stream resource in /home/bigswin/public_html/administrator/components/com_virtuemart/plugins/vmpsplugin.php on line 943
Thank you for your order!