net-snmp 安装问题求助

我在WINDOWS环境下，设置Configuring: rocommunityDescription:a SNMPv1/SNMPv2c read-only access community namearguments: community [default|hostname|network/bits] [oid]

我输入的是The community name to add read-only access for: rocommunity public

但是老是报错substr outside of string at C:/Perl/lib/Term/ReadLine/readline.pm line 197Use of uninitialized value in length at C:/Perl/lib/Term/ReadLine/readlinene 1785.Use of uninitialized value in length at C:/Perl/lib/Term/ReadLine/readlinene 1791.Use of uninitialized value in substr at C:/Perl/lib/Term/ReadLine/readlinene 1802.The hostname or network address to accept this community name from [RETURNll]: Use of uninitialized value in length at C:/Perl/lib/Term/ReadLine/reapm line 2046.    
不知道是什么地方出错了