闪亮 - renderUI中的renderPlot - as.character（x）中的错误：无法强制将类型'closure'强制类型为'character'类型的向量

I'm pretty new at this so forgive me - I'm building an app in Shiny that takes an uploaded data file of a fixed format, and renders out various plots based on user selections. One important part of the app is a set of tabs which each contain one plot.I'm pretty new at this so forgive me - I'm buil