Save/Update Zoho lead using rails application

Save/Update Zoho lead using rails application

Hello,

I have developed a ROR application and connected it with Zoho to save the Leads. I have created several fields in Zoho whose screenshot is as follows: 
http://imageshack.com/i/poRMyXtPp
http://imageshack.com/i/pmPrICPDp

I am creating and updation the records using Zoho API in my application and I am able to save the data like name , email etc. 
But while saving the fields present in my second screenshot such as Monthly Electric Bill, Vehicle Fuel, Gas, Monthly Vehicle Fuel Bill etc, I am getting below error:

Message: A Zoho Lead just failed to save<br> Exception: undefined method `monthly_electric_bill' for #<RubyZoho::Crm::Lead:0x00000006fea1e0> 

I have checked in Zoho application and found that the field "Monthly Electric Bill " is present, but while accessing the same using Zoho API in rails console, I didn't get the field to which I can save the data.

Below are the response from Zoho API calling from Rails console:

[1] pry(main)> RubyZoho::Crm::Lead.find_by_email(" abc.abc@xyz.com")
=> [#<RubyZoho::Crm::Lead:0x0000000#######
  @created_by="XYZXYZXYZ",
  @created_time="2017-03-29 00:33:52",
  @email=" abc.abc@xyz.com",
  @email_opt_out="false",
  @fields=
   [:module_name,
    :leadid,
    :id,
    :smownerid,
    :lead_owner,
    :first_name,
    :last_name,
    :email,
    :smcreatorid,
    :created_by,
    :modifiedby,
    :modified_by,
    :created_time,
    :modified_time,
    :email_opt_out,
    :last_activity_time,
    :venture_partner],
  @first_name="Anonymous",
  @id="995316000003202009",
  @last_activity_time="2017-03-29 00:33:52",
  @last_name="N/A",
  @lead_owner="XYZXYZXYZ",
  @leadid="995316000003######",
  @modified_by="XYZXYZXYZ",
  @modified_time="2017-03-29 00:33:52",
  @modifiedby="995316000000065001",
  @module_name="Leads",
  @smcreatorid="99531600000######",
  @smownerid="99531600000######",
  @venture_partner="XYZ">]

  Can anyone tell me why I am not getting the fields while accessing Leads via API?