You have renamed theMain.java file in ModulusPlaceValue.java. But the start button in Replit launches only the file that is registered in the .replit file (for Java, it is standard Main.java).
You can rename the ModulusPlaceValue.java file in Main.java, or configure the .replit file to run the ModulusPlaceValue.java file.
How to configure the .replit file:
Just click the ⋮ next to “Files” then click “Show hidden files”. Next click on the .replit file and finally you can change the entrypoint to whatever file you want to run.