You haven't mentioned the error that has happened in the application form. Few details can be corrected and few cannot be corrected. NTA will open the correction window from January 19th and you can make corrections to your application form until January 21st. During this period you can make changes to the required fields in the application form .Other fields that you can make changes to are:

1. Personal Details
2. Academic Details
3. Change of Paper
4. Language
5. Name
6. State of Eligibility
7. Date of Birth
8. Category

So when the correction window opens, you can make changes to your application. There is nothing to be worried about it. For more information, please read our article: https://engineering.careers360.com/articles/jee-main-application-form-correction