Always get ERROR, please help me

[=?gb2312?B?BA==?=]

Hello,
 
I'm Frank in Beijing China, just use webcvs, and got following Error:
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Error: Failed to spawn GNU rlog on 
"/cvs/PROGRAM/MO/client/Riso/mapfile//mapfile.c,v, 
/cvs/PROGRAM/MO/client/Riso/mapfile//mapfile.h,v". 

Did you set the $command_path in your configuration file correctly ? 
(Currently "/bin:/usr/bin:/usr/local/bin"

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I am using Redhat9 ,have installed rcs 5.7 and perl 5, cvs-1.11.6(in 
/opt/cvs/bin) have been installed and have httpd 2.0.47.
I try following :
1)make a link of /opt/cvs/bin/cvs at /usr/bin/, this didn't work;
2)cp /opt/cvs/bin/cvs /usr/bin, also not;
3)add /opt/cvs/bin to $command_path in cvsweb.conf, also not;

I have another Redhat 7.2, where ever I install the cvs ,webcvs always 
work,strange!
I really need your help

BR
Frank

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