Update - 12/17/2012 9am CDT: example has been updated with demo data and full code. [/update].
Example Data: https
In ui.R, you should not have a comma at the end of this line:
sliderInput("age_cut", "Select Size of Age Brackets:",
min= 3, max= 20, value= 5),
There also shouldn't be a comma at the end of this line
checkboxInput(inputId = "h_own", label = "Homeownership", value = FALSE),
In general, you shouldn't have a comma after the last component of a section. Just like with any R function, you don't usually end the function call with a comma. e.g. sum(5,)
gives an error.