SPIN/JACKSON-JSON-01002 Expected 'SpinList', got 'OBJECT'

Hello, I’m a bit new in Camunda.

I get an error when adding variable to idDcoumento from tasklist in http-connector in payload variable.

The inlined javascript is as follow:

var postJSONTemp = ‘{
“idUsuario”: "’+idUsuario+‘",
“idDocumento”: "’+idDocumento+‘",
“token”: "’+token+‘"
}’;
postJSONTemp;

The error i get is :

An error happened while submitting the task form : Cannot submit task form 39766db9-b5fd-11ee-bcf8-00090faa0001: Unable to evaluate script:org.camunda.spin.json.SpinJsonDataFormatException: SPIN/JACKSON-JSON-01002 Expected ‘SpinList’, got ‘OBJECT’

Appreciate any help.