Open Cart 1.5.4 checkout debug (opencart)

I need debugging for my 1.5.4 opencart site. The following error codes I refer to: Invalid argument supplied for foreach() in /home/gyogyito/public_html/vqmod/vqcache/[login to view URL] on line 140 Undefined variable: totals in /home/gyogyito/public_html/vqmod/vqcache/[login to view URL] on line 150 Invalid argument supplied for foreach() in /home/gyogyito/public_html/vqmod/vqcache/[login to view URL] on line 150 Undefined variable: text_message_bottom in /home/gyogyito/public_html/vqmod/vqcache/[login to view URL] on line 160 Undefined index: fax in /home/gyogyito/public_html/catalog/controller/onecheckout/[login to view URL] on line 136 Undefined index: company in /home/gyogyito/public_html/catalog/controller/onecheckout/[login to view URL] on line 140 Undefined index: address_2 in /home/gyogyito/public_html/catalog/controller/onecheckout/[login to view URL] on line 144 Undefined index: company in /home/gyogyito/public_html/catalog/controller/onecheckout/[login to view URL] on line 212 Undefined index: address_2 in /home/gyogyito/public_html/catalog/controller/onecheckout/[login to view URL] on line 216 Undefined index: payment_code in /home/gyogyito/public_html/vqmod/vqcache/[login to view URL] on line 121 Your success is: - to eliminate the root of the bugs (with keeping all checkout functionality of course) - and send me a list of the files which were modified.