Yes reactiveEval() is part of shiny, not a custom function defined by me. I don't know how useful a reprex would be because there are datasets in the code that you would have to download. Anyways, here is the full error message if this helps you help me "Warning: Error in reactiveEval: could not find function "reactiveEval"
47: server [C:/Users/lomei/Desktop/SWAT_Visualization/app_redesign_3.R#361]
Error in reactiveEval() : could not find function "reactiveEval"
By the way, I'm a very novice R coder so sorry if I don't understand R etiquette well.