Kamailio fails to start and I see the following errors:

kamailio[2115]: ERROR: <core> [core/pvapi.c:1085]: pv_parse_spec2(): bad tr in pvar name "jsonrpl"
kamailio[2115]: ERROR: <core> [core/pvapi.c:1111]: pv_parse_spec2(): invalid parsing in [$(jsonrpl(body){kz.json, result.NRSETS})] at (4)
kamailio[2115]: CRITICAL: <core> [core/cfg.y:3447]: yyerror_at(): parse error in config file /etc/kazoo/kamailio/dispatcher-role.cfg, line 243, colu...ult.NRSETS})

I installed kamailio-json-modules,

Kamailio v5.1.2 installed from DEB packets from deb.kamailio.org

What is the cause of the error?