Problem with diskless server setup on Solaris

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I tried to setup diskless server on Solaris 10. Fullfilled all the steps for preparations.
# cd /cdrom/sol_10_305_x86/s2/Solaris_10/Tools/
# ./setup_install_server /export/install/sol_10_a
Verifying target directory...
Calculating the required disk space for the Solaris_10 product
Calculating space required for the installation boot image
Copying the CD image to disk...
Copying Install Boot Image hierarchy...
Install Server setup complete

And started the following command:
# /usr/sadm/bin/smosservice add -H kali:898 -- -o kali -x \ mediapath=/export/install/sol_10_a -x platform=i386.i86pc.Solaris_10 -x cluster=SUNWCXall -x locale=en_US

It returned the following output:
Authenticating as user: root

Type /? for help, pressing <enter> accepts the default denoted by [ ]
Please enter a string value for: password ::
Loading Tool: com.sun.admin.osservermgr.cli.OsServerMgrCli from kali:898
Login to kali as user root was successful.
Download of com.sun.admin.osservermgr.cli.OsServerMgrCli from kali:898 was successful.
Failed to create clone area /export/root/clone/Solaris_10/i86pc.

It was x86 machine, but I tried the same on sparc Solaris - the result was the same.