Napp-it ProFTPD Problem

[Deleted member 14417]

I have installed the ProFTPD add-on by following this page. However, it seems have some compile issues. I got a lot of similar errors before the end of the install process.

mod_auth_file.c: in function 'af_setpwent':
mod_auth_file.c:865:13: warning: format '%o' excepts argument of type 'unsigned int', but argument 6 has type 'long unsigned int' [-Wformat=]

"error: unable to open AuthUserFile file '%s' (file owned by "
​

I can't catch the previous errors since it's too quickly. But it seems are pretty much the same with this one. Anyone know anything about this problem?

Thanks in advance. I am new to the Linux and Unix world. Sorry for any inaccurate describe.