A config issue about using kamailio as pcscf related with "uac_req"

To whom may concert:

Thank you very much for your time reading this e-mail.

I have a config issue when I use kamailio as pcscf. It report the following message when I type ./kamailio -c:
0(1121575) ERROR: <core> [core/pvapi.c:924]: pv_parse_spec2(): error searching pvar "uac_req"
0(1121575) ERROR: <core> [core/pvapi.c:1127]: pv_parse_spec2(): wrong char [m/109] in [$uac_req(method)] at [9 (5)]

I notice that Miconda post at https://github.com/kamailio/kamailio/issues/1123:
[cid:[email protected]]

So I add -DWITH_NATPING to C_DEFS in config.mak，and recompile kamailio, but I still get the same error message showing above.

Here are more information:
kamailio version: 5.5    I download source code from https://github.com/kamailio/kamailio/tree/5.5.0
Comile step:
make cfg include_modules="cdp cdp_avp db_unixodbc ims_dialog ims_ipsec_pcscf ims_qos ims_registrar_pcscf ims_usrloc_pcscf xmlrpc"
make all
config files:   from the source code packet:  kamailio-5.5.0/misc/examples/ims/pcscf

So I am writing this e-mail for help, thank you very much.
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