Can't locate SFCheckPreReq.pm

[maccury]

Hi QuiLoxx,
I run this tool today and got some error message.
Step 1 finished
Step2
Can't locate SFCheckPreReq.pm in @inc (you may need to install the SFCheckPreReq module) (@inc contains: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5 /usr/share/perl5) at ./sf_host_input_agent.pl line 8
BEGIN failed--compilation aborted at ./sf_host_input_agent.pl line 8

So Step2 failed
Do you have any idea about this error message?