How to reconnect disconnected connection with server using blazor

You need to review the code in the "buildRenderTree" method and identify the object that is null or has not been initialized. Once you have identified the object, you need to make sure that it is properly initialized before it is accessed in your code. This can be done using conditional statements or null checking to ensure that the object is not null before accessing it.

Additionally, it may be helpful to use debugging tools such as breakpoints or console logging to help identify the source of the issue and track down the specific line of code that is causing the error.