These errors you’re seeing are often due to attempted access or invocation of properties or methods from an undefined variable in your code. ‘TypeError: Cannot read properties of undefined’ implies that somewhere in your code, you might be trying to access the ‘id’ property of an object that is undefined. Similarly, ‘o is not a function’ implies that you’re trying to execute ‘o’ like a function while it’s not actually a function. These could occur due to errors in your conversion from Google Analytics 3 to 4, such as not correctly initializing a variable or missing parameters. Debugging the codebase to identify where these undefined references originate is a good start to resolve these issues. It is also possible that some parts of your application may not be compatible with Google Analytics 4 hence causing these issues. It would be a good idea to cross-check your implementation against the official documentation of Google Analytics 4 or Firebase. It’s always helpful to ensure the libraries and packages being used are updated and compatible with each other.