Think of two pieces of code (let's call them A and B) that need each other to work. A says, "I need B to do my job," and at the same time, B says, "I need A to do my job." But if A is waiting for B to work, and B is waiting for A to work, neither can start working. This "waiting on each other" situation causes Python to get stuck and throw a circular import error.

The "Unsupported class file major version 61" error in Java means you're trying to run a Java program that's too advanced for the version of Java you have installed. To fix this, either update your Java to version 17 or newer, otherwise recompile the program with an older Java version that matches your runtime environment.