What does error code JG_1.9.0 mean on KTM Duke 125?
That's a different error on a completely different bike ?https://www.quora.com/What-does-error-code-JG_1-7-7-mean-on-KTM-Duke-200-Where-can-I-get-the-error-codes-list says
If you have this error, then it might mean two things.
Your battery is low or it is not charging properly. If you recharge the battery, bike will start again . But if you again face the same issue after some time , then there is nothing wrong with your battery. It is a different problem.
The other problem is that, your relay coil would have been damaged or burnt, which in a nutshell means that the charge from the battery is not transferred to bike. So you will have to replace the relay coil.