[academic] "Homepage not found" error after upgrading from Hugo 0.63.0 to 0.67.0

After I upgraded my Hugo to 0.67.0 and Academics to 4.8, I began to get the following error message when I execute blogdown::build_site(): Homepage not found or duplicate homepages detected for a localization!. Before the upgrade, it was compiling without any problem. The source code of my web site is found at

Can anyone help me?