ETL processor erroring out while trying to import JSON to Orient 3.0.4.

[veenavupp]

Json is from, https://orientdb.com/docs/last/etl/Import-from-JSON.html site.

pasting it below for reference.
[
{
"name": "Joe",
"id": 1,
"friends": [2,4,5],
"enemies": [6]
},
{
"name": "Suzie",
"id": 2,
"friends": [1,4,6],
"enemies": [5,2]
}
]

config json:

{
"config": {
"log": "debug"
},
"source" : {
"file": { "path": "/tmp/database.json" }
},
"extractor" : {
"json": {}
},
"transformers" : [
{ "merge": { "joinFieldName": "id", "lookup": "Account.id" } },
{ "vertex": { "class": "Account"} },
{ "edge": {
"class": "Friend",
"joinFieldName": "friends",
"lookup": "Account.id",
"unresolvedLinkAction": "CREATE"
} },
{ "edge": {
"class": "Enemy",
"joinFieldName": "enemies",
"lookup": "Account.id",
"unresolvedLinkAction": "CREATE"
} }
],
"loader" : {
"orientdb": {
"dbURL": "plocal:/tmp/databases/db",
"dbUser": "admin",
"dbPassword": "admin",
"dbAutoDropIfExists": true,
"dbAutoCreate": true,
"standardElementConstraints": false,
"tx": false,
"wal": false,
"batchCommit": 1000,
"dbType": "graph",
"classes": [{"name": "Account", "extends":"V"}, {"name": "Friend", "extends":"E"}, {"name": 'Enemy', "extends":"E"}],
"indexes": [{"class":"Account", "fields":["id:integer"], "type":"UNIQUE_HASH_INDEX" }]
}
}
}