闪亮错误:反应性函数的问题

I am making an interactive graph in R studio with the new shiny markdown. What the idea is to create an active page where you have two input fields to determine the size of a, the size of b and what is left is the size of c. The input is in percentage. The output is a graph with a line and bars, which works. However, I have two problems.I am making an interactive graph in R studio wi