RStudio在输入代码后不会在控制台显示任何输出

I am really new to R and programming in general, I have been using RStudio to do some graphics and simple (beginner) programs. Everything was working fine until today. My problem is that now when I enter code there´s no return in the console, I mean it does compile the code but does not return any output. I am really new to R and programming in general