paypal error 10413

hi,when some use paypal express checkout for payment method in my website,then got an error like this:
10413 Transaction refused because of an invalid argument. See additional error messages for details. - The totals of the cart item amounts do not match order amounts.
but someone can success,my version is 1.3.7.1,and below is the part of the log
DoExpressCheckoutPayment, Elapsed: 357ms -- Failure

TIMESTAMP=2013%2d01%2d16T14%3a39%3a03Z&CORRELATIONID=a9891b23560ce&ACK=Failure&VERSION=3%2e2&BUILD=4181146&L_ERRORCODE0=10413&L_SHORTMESSAGE0=Transaction%20refused%20because%20of%20an%20invalid%20argument%2e%20See%20additional%20error%20messages%20for%20details%2e&L_LONGMESSAGE0=The%20totals%20of%20the%20cart%20item%20amounts%20do%20not%20match%20order%20amounts%2e&L_SEVERITYCODE0=Error&CURL_ERRORS=

have someone the same issue and fixed it,thanks a lot

my version is 1.3.7.1
You seriously need to upgrade

You are using v1.3.7.1 which was released in 2007.

The problem you mention was fixed in 1.3.9 and 1.5.0

hi,but i have modify many file,so it is difficult for me upgrade to new version,and weather i can modify certain file relative with paypal express checkout to fix the problem?
thanks a lot

hellogxp:

hi,but i have modify many file,so it is difficult for me upgrade to new version
And the bugs in your old version also required modifying many files to FIX them.
It's difficult for me to remember what lines were changed to fix your specific problem, especially when it was 6 years ago.

In the past 6 years since you installed your version, thousands of lines of code have been improved/fixed/changed, and you've ignored them all. The task simply gets bigger every day that you ignore it.