patch -R < filename

Hi Can any one please assist me, I am trying to remove the patch in the reverse order. I am in the correct patch directory and when I am trying to executing the command below:

[root@linuxserver patches]#patch -R < dhcp_ordering.diff

I get these messages:

[root@linuxserver patches]# patch -R < dhcp_ordering.diff
(Stripping trailing CRs from patch.)
can't find file to patch at input line 5
Perhaps you should have used the -p or --strip option?
The text leading up to this was:
--------------------------
|Index: lib/perl/Mercury/V1_0_0_0.pm
|===================================================================
|--- lib/perl/Mercury/V1_0_0_0.pm (revision 15613)
|+++ lib/perl/Mercury/V1_0_0_0.pm (working copy)
--------------------------
File to patch:

And you are sure lib/perl/Mercury/V1_0_0_0.pm exists in that location relative to the current path?