could not find function "eventReactive" - html

Question

When I run the app in Ubuntu it works perfectly but when I run in on Mac OSX, things (like buttons) are not aligned and after a while I get the following error:
> shiny::runApp()
Loading required package: shiny
Listening on http://127.0.0.1:7240
Loading required package: lattice
Loading required package: ggplot2
data.table 1.8.10 For help type: help("data.table")
Error in (structure(function (input, output) :
could not find function "eventReactive"
ERROR: [on_request_read] connection reset by peer
Here's some part of code:
trainres <- eventReactive(input$buttontrain, {
thisfds = list(); singtrain = NULL; singtest = NULL
thiskfkds = list(); multtrain = NULL; multtest = NULL
yvectr = NULL; yvects = NULL; predvectr = NULL; predvects = NULL
tim = 0.0
if(input$dbterm == "Multi table") {
thiskfkds = append(thiskfkds, KFKD(EntCol=input$fk1, AttCol=input$pk1, UseFK=input$usefk1))
if(!is.null(input$fk2)) {
thiskfkds = append(thiskfkds, KFKD(EntCol=input$fk2, AttCol=input$pk2, UseFK=input$usefk2))
}
if(!is.null(input$fk3)) {
thiskfkds = append(thiskfkds, KFKD(EntCol=input$fk3, AttCol=input$pk3, UseFK=input$usefk3))
}
cat("KFKDs:\n")
print(thiskfkds)
multtrain = switch(input$dataset,
"Walmart" = MultData(Target=as.data.frame(WStr[,1]), EntTable=WStr[,-1], AttTables=list(WR1, WR2), KFKDs=thiskfkds),
"Walmart (R)" = MultData(Target=as.data.frame(DWStr[,1]), EntTable=DWStr[,-1], AttTables=list(DWR1, DWR2), KFKDs=thiskfkds),
"Yelp" = MultData(Target=as.data.frame(YStr[,1]), EntTable=YStr[,-1], AttTables=list(YR1, YR2), KFKDs=thiskfkds),
"Yelp (R)" = MultData(Target=as.data.frame(DYStr[,1]), EntTable=DYStr[,-1], AttTables=list(DYR1, DYR2), KFKDs=thiskfkds),
"Expedia" = MultData(Target=as.data.frame(EStr[,1]), EntTable=EStr[,-1], AttTables=list(ER1, ER2), KFKDs=thiskfkds),
"Expedia (R)" = MultData(Target=as.data.frame(DEStr[,1]), EntTable=DEStr[,-1], AttTables=list(DER1, DER2), KFKDs=thiskfkds),
"Flights" = MultData(Target=as.data.frame(FStr[,1]), EntTable=FStr[,-1], AttTables=list(FR1, FR2, FR3), KFKDs=thiskfkds),
"Flights (R)" = MultData(Target=as.data.frame(DFStr[,1]), EntTable=DFStr[,-1], AttTables=list(DFR1, DFR2, DFR3), KFKDs=thiskfkds)
)
Here's how apps looks like after running:
Here's the code in ui.R:
library(shiny)
library(caret)
shinyUI(fluidPage(
list(tags$head(HTML('<h4><table><tr><td rowspan="2"><img src="http://umark.wisc.edu/brand/templates-and-downloads/downloads/print/UWCrest_4c.jpg"
border="0" style="padding-right:10px" width="34" height="40" alt="UW-Madison Database Group"/>
</td><td><b>Santoku</b></td></tr><tr><td>University of Wisconsin-Madison Database Group</td></tr></table></h4>'))),
sidebarLayout(
sidebarPanel(width = 6,
wellPanel(fluidRow(column(6, radioButtons("dbterm", "Database Type", c("Multi table", "Single table"))),
column(6, selectInput("dataset", "Load Dataset", c("Walmart", "Walmart (R)", "Yelp", "Yelp (R)", "Expedia",
"Expedia (R)", "Flights", "Flights (R)")))),
uiOutput("uideps")),
wellPanel(fluidRow(column(6, radioButtons("mlalgo", "ML Model:", c("Logistic Regression" = "lr", "Naive Bayes" = "nb",
"TAN" = "tan", "Decision Tree" = "dt"))),
column(6, uiOutput("uimlpt"))),
fluidRow(div(class="padding2", column(3, checkboxInput("checkcv", "Validate", TRUE))),
div(class="padding3", column(2, actionButton("buttontrain", "Learning"))),
div(class="padding4", column(3, actionButton("buttonfe", "Feature Exploration")))))
),
mainPanel(width = 6,
tabsetPanel(
tabPanel("Single Learning", verbatimTextOutput("trainreso")),
tabPanel("Feature Exploration", plotOutput("feplotso"))
#tabPanel("Wiki", verbatimTextOutput("Wiki")),
#tabPanel("Analysis", tableOutput("plots"))
)
)
)#end sidebarLayout
))#end main

Answer 1

The current version is shiny 0.12.2 in this version there is a function called eventReactive. To quickly update you can use the code;
install.packages(shiny)