Error: -32602 (Invalid params.): No permissions to referred object or it does not exist!

Hi,
I use this Zabbix provider (https://registry.terraform.io/providers/tpretz/zabbix/latest/docs/resources/graph)
I have this terraform code:

...
resource "zabbix_item_snmp" "snmp_proc_myprocess_item" {
  hostid     = data.zabbix_template.template.id
  key        = "snmp_proc_myprocess"
  name       = "myprocess Process Count"
  valuetype  = "unsigned"
  delay      = "1m"
  history    = "90d"
  snmp_oid   = "UCD-SNMP-MIB::prCount[\"index\", \"UCD-SNMP-MIB::prNames\", \"myprocess\"]"
  depends_on = [data.zabbix_template.template]
}


resource "zabbix_graph" "graph_proc_myprocess" {
  name    = "myprocess Process Count"
  width   = "900"
  height  = "200"
  item {
    color   = "FF0000"
    itemid  = "${zabbix_item_snmp.snmp_proc_myprocess_item.id}"
  }
}

When I run the first time, I don’t receive error.
If I try to re-run, I receive this error:

Error: -32602 (Invalid params.): No permissions to referred object or it does not exist!

│ with module.myprocess-servers_triggers.zabbix_graph.graph_proc_myprocess,
│ on myprocess-servers-triggers/triggers.tf line 254, in resource “zabbix_graph” “graph_proc_myprocess”:
│ 254: resource “zabbix_graph” “graph_proc_myprocess” {

Where am I wrong?