Pfthb

Good day developers. I am having a bit of an issue dealing with R Shiny here. I have a webpage where I can click on a button and open a modal. The modal is a form that takes inputs. I want to use these modal inputs in a string and print that variable. I always get the following errors:

Operation not allowed without an active reactive context. (You tried
to do something that can only be done from inside a reactive
expression or observer.)

and sometimes this when I remove reactivity:

Warning: Error in as.vector: cannot coerce type 'closure' to vector of
type 'character'

 # Shiny App: Server
 tab_tab1_server <- function(input, output, session) 

 # Defining a modal containing input boxes
 tab1_modal <- function(failed = FALSE) 
 modalDialog(
 title = "Tab 1", size = "l",

 fluidRow(
 box(title = "Names", background = "green", collapsible = TRUE, width = 12, collapsed = TRUE,
 splitLayout(
 textInput(inputId = "GRP_ID",label = "Group ID", value = "1337"),

 fluidRow(
 box(title = "Names", background = "green", collapsible = TRUE, width = 12, collapsed = TRUE,
 splitLayout(
 textInput(inputId = "GRP_ID",label = "Object ID", value = "1337")
 ,textInput(inputId = "GRP_DESC",label = "Object Description", value = "Ahmads Test Entry"))

 ))
 )
 

# button to show modal
observeEvent(input$add_btn, 
 showModal(tab1_modal()))

# Variable to contain entire script including text from input variables
result<-sprintf("This is your input", GRP_ID,GRP_DESC)

# Button to print variable in console
observeEvent(input$result_btn, 
 print(paste0("Showing result:",result ))
)

Please tell me how to use the inputs in the modal for another action.