WARNING LETTER AND BRITISH NATIONALITY help

[yasirctl00001]

I got formal warning from tfl (transport for london)on 7/11/2014 as tfl inspector stop me at underground station as i had not valid oyster card.
he took my details and told me i will receive letter from tfl in few days.

I received letter from tfl to ask me to explain the incident and i explained in detail that it was mistake and i forgot to touch the oyster card so please don't take me to court.

Then they sent me warning letter after one week with £100 to pay as administrative costs and warn not to do this again. I paid next day £100 from card and finished the matter.

I just want to ask i want to apply for UK naturalization in April 2015 ... can you please advice me weather my application refuse because of this formal warning or not.....

Do i need to disclose about this warning in section 3 in Good character requirement or not ....

please need your help thanks