Cannot read properties of null

This error message typically means that your code is trying to access a property or method of a null value. In other words, you are trying to use something that does not exist.

For example, if you have an object called "person" and you try to access the property "name" like this: "person.name", but "person" is null or undefined, you will get this error.

To fix this error, you need to make sure that the value you are trying to access actually exists. You can do this by checking if the value is null or undefined before trying to access its properties or methods.