The NAV text file URL on the amfiindia website has changed. To fix this problem, do the following steps:
# cd /usr/lib/perl5/vendor_perl/5.10.0/Finance/Quote
# vi IndiaMutual.pm
Search for $AMFI_URL = (“${AMFI_MAIN_URL}downloadnavopen.asp”);
replace with $AMFI_URL = (“${AMFI_MAIN_URL}NavReport.aspx?type=0”);
Save your changed IndiaMutual.pm file
# exit
Now start GnuCash and retrieve the quotes for your Mutual Fund.