Error RDFXX

.....: Bad argument to iri_to_id (), type 189
in
iri_to_id:(BIF),
        __01 => 0,
DB.DBA.SPARUL_CLEAR([executable]/sparql.sql:8735),
  graph_iris => (ARRAY_OF_POINTER value, tag 193),
  inside_sponge => 0,
         uid => 0,
    log_mode => NULL,
  compose_report => 1,
     options => NULL,
      silent => 0,
ODS.ODS_API.graph_clear:10,
       graph => 0,
sioc.DBA.acl_check:19,
  acl_graph_iri => 'https://ods-qa.openlinksw.com/dataspace/kidehen/calendar/kidehen%27s%20Calendar/webaccess',
  acl_groups_iri => 'https://ods-qa.openlinksw.com/dataspace/private/kidehen',
    acl_iris => (ARRAY_OF_POINTER value, tag 193),
CAL.WA.acl_check:20,
   domain_id => 57,
          id => NULL,
CAL.WA.access_rights:40,
   domain_id => 57,
  account_id => -1,
CAL.WA.session_restore:11,
      params => (ARRAY_OF_POINTER value, tag 193),
page__DAV_VAD_Calendar_www_home_vspx(/DAV/VAD/Calendar/www/home.vspx-sql:2028),
        SELF => reference 0x7fbf90109838 to instance 0x7fbfb55e4a08 of DB.DBA.page__DAV_VAD_Calendar_www_home_vspx,
        path => (ARRAY_OF_POINTER value, tag 193),
      params => (ARRAY_OF_POINTER value, tag 193),
       lines => (ARRAY_OF_POINTER value, tag 193),
signal:(BIF),
        __01 => 'RDFXX',
        __02 => '.....: Bad argument to iri_to_id (), type 189
in
iri_to_id:(BIF),
        __01 => 0,
DB.DBA.SPARUL_C' (truncated),
DB.DBA.vspx_dispatch([executable]/vspx.sql:5903),
  resource_name => '/DAV/VAD/Calendar/www/home.vspx',
        path => (ARRAY_OF_POINTER value, tag 193),
      params => (ARRAY_OF_POINTER value, tag 193),
       lines => (ARRAY_OF_POINTER value, tag 193),
  class_name => 'page__DAV_VAD_Calendar_www_home_vspx',
  compile_only => 0,
  vspx_dbname => 'DB',
   vspx_user => 'dba',
WS.WS.GET([executable]/dav.sql:2968),
        path => (ARRAY_OF_POINTER value, tag 193),
      params => (ARRAY_OF_POINTER value, tag 193),
       lines => (ARRAY_OF_POINTER value, tag 193)