you are charges for a petty offence, which punishment is only fine.you can either pay it after pleading guitly or defend you by going for a trial.
Sec.283. of IPC is ------Danger or obstruction in public way or line of navigation.—Whoever, by doing any act, or by omitting to take order with any property in his possession or under his charge, causes danger, obstruction or injury to any person in any public way or public line of navigation, shall be punished with fine which may extend to two hundred rupees.
By getting charged under sec.283 , your career has no problem in future,since you are booked for apetty offence you will have to pay the fine before the magistrate.The offence under this section is cognizable, bailable and non-compoundable, and is friable by any magistrate.the punishment is only fine of rs.200.
Even if there were many vehicles, yours was picked up , this does not mean that you have not done wrong.
if there was a notification and you breached it , yes it can be an offence .If you feel you have not committed an offence you should defend it to prove your innocence based on the fact that you have not done the act, not that others are not punished.The nature of parking doesn't make it an offence , if the parking was legally restricted and you parked the car , then it defines an offence.
pleading guilty is advisable as the fine you will have to remit and end the matter there. The trial can be taken if you chose not to plead guilty, then police will have to prove their case.