Object reference not set to an instance of an object error

Please go through below link and article to understand.

https://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-and-how-do-i-fix-it

https://www.c-sharpcorner.com/article/handling-the-error-object-reference-not-set-to-an-instance-of-object/ 

Object reference not set to an instance of an object error means somewhere the object is null and you are trying to use that object in some other place.

  

Watch this video for example,

 

https://www.youtube.com/watch?v=GwtevbSLuXQ

 

Also, you need to debug the code where exactly it is getting null. If you resolve the null value then it will work fine.

 

Thanks.