Error: no such plugin fullcalendar

%STARTSECTION{"json-events"}%<noautolink>%DBQUERY{
  "TopicType=~'\bEvent\b' AND StartDate LATER_THAN_OR_ON '%URLPARAM{"start" default="1 Jan 1970"}%' AND EndDate EARLIER_THAN_OR_ON '%URLPARAM{"end" default="%GMTIME%"}%'"
  header="[$n"
  footer="$n]"
  separator=",$n"
  format="{
    \"id\": \"$web.$topic\",
    \"web\": \"$web\",
    \"topic\": \"$topic\",
    \"title\": \"$expand(topictitle)\",
    \"start\": \"$expand(StartDate)\",
    \"end\": \"$expand(EndDate)\",
    \"allDay\": $expand(AllDay or 'false'),
    \"className\": \"$expand(Class)\",
    \"url\": \"%SCRIPTURLPATH{"edit"}%/$web/$topic?t=%GMTIME{"$epoch"}%;redirectto=%BASEWEB%.%BASETOPIC%;action=form\"
  }"
}%</noautolink>%ENDSECTION{"json-events"}%

---++ All known events
%DBQUERY{"TopicType=~'\bEvent\b'"
   header="| *#* | *Topic* | *Title* | *StartDate* | *EndDate* |$n"
   format="| $index | [[$web.$topic][<nop>$topic]] | $expand(topictitle) | $expand(StartDate) | $expand(EndDate) |"
   separator="$n"
}%