Reg error in policy module

[baskar baskar]

Hi,
I have written this module and saved as twiki.te

policy_module(twiki, 1.0)
require {
        type httpd_sys_script_exec_t;
        type sbin_t;
        type tmp_t;
        type ls_exec_t;
        type httpd_tmp_t;
        type httpd_sys_script_t;
      }
allow httpd_sys_script_t httpd_sys_script_exec_t:dir read;
allow httpd_sys_script_t ls_exec_t:file getattr;
allow httpd_sys_script_t sbin_t:file getattr;
allow httpd_sys_script_t tmp_t:lnk_file read;
allow httpd_sys_script_t httpd_tmp_t:file { r_file_perms unlink write }; 

when i try to run 
semodule -i twiki.pp

i am getting
libsepol.permission_copy_callback: Module twiki depends on permission setkeycreate in class process, not satisfied
libsemanage.semanage_link_sandbox: Link packages failed
semodule:  Failed!

this error.
please anyone help me
i am configuring twiki now
without this i cant move to next step
please send me solutions
thanks in advance
Regards
Baskar.N




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