SiriKali : Error while importing PGP key

While trying to install https://aur.archlinux.org/packages/sirikali it says

:: (1/1) Parsing SRCINFO: sirikali
gpg: WARNING: unsafe permissions on homedir '/home/user/.gnupg'
gpg: error reading key: No public key

 :: PGP keys need importing:
 -> 6855E493B5B2DF96E319BB6D16E2E1ACC6F51242, required by: sirikali
:: Import? [Y/n] 
:: Importing keys with gpg...
gpg: WARNING: unsafe permissions on homedir '/home/user/.gnupg'
gpg: key 16E2E1ACC6F51242: no user ID
gpg: Total number processed: 1
 -> problem importing keys

While run as sudo it says

==> ERROR: Running makepkg as root is not allowed as it can cause permanent,
catastrophic damage to your system.
 -> error making: sirikali-exit status 10
 -> Failed to install the following packages. Manual intervention is required:
sirikali - exit status 10

Any ideas?

I reported the issue at GitHub but I think it’s issue on my end.