I want to create an action with zabbix api in java , but I got an error

[java_noob]

like this "{"code":-32602,"data":"Incorrect parameter for action \\"actionName\\".","message":"Invalid params."}"
I have checked my params many times but I can't find where the wrong is...there are my params
{
"def_longdata ": "{TRIGGER.NAME}: {TRIGGER.STATUS}\r\nLast value: {ITEM.LASTVALUE}\r\n\r\n{TRIGGER.URL}",
"def_shortdata ": "{TRIGGER.NAME}: {TRIGGER.STATUS}",
"esc_period ": 0,
"eventsource ": 0,
"filter": {
"conditions": [{
"conditiontype": 1,
"operator": 0,
"value": "10434"
}],
"evaltype": 0
},
"name": "actionName",
"operations": [{
"esc_period": 120,
"esc_step_from": 1,
"esc_step_to": 1,
"evaltype": 0,
"operationtype": 0,
"opmessage": {
"default_msg": 1,
"mediatypeid": "1"
},
"opmessage_grp": [{
"usrgrpid ": "7"
}]
}],
"status ": 0
}
There is a great need for help. Thanks in advance!