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Offline Programming (GUI) Errors

Hello. I am trying to study how to put a GUI on a program using this I am testing it on a weld simulation, but it is not working. I would appreciate the help so I can better understand how to use Pythong API on RoboDK. 

When I run the program, I get this and I don't understand it:
PS C:\Users\Andrew L. Nguyen> & C:/RoboDK/Python37/python.exe "c:/Users/Andrew L. Nguyen/AppData/Local/Temp/"
Invalid item provided: The item identifier provided is not valid or it does not exist.Exception in Tkinter callback
Traceback (most recent call last):
 File "C:\RoboDK\Python37\lib\tkinter\", line 1705, in __call__
   return self.func(*args)
 File "c:/Users/Andrew L. Nguyen/AppData/Local/Temp/", line 143, in ExecuteChoice
 File "c:/Users/Andrew L. Nguyen/AppData/Local/Temp/", line 51, in RunProgram
   poseref = target.Pose()
 File "C:\RoboDK\Python\robodk\", line 4307, in Pose
 File "C:\RoboDK\Python\robodk\", line 764, in _check_status
   raise Exception(self.LAST_STATUS_MESSAGE)
Exception: Invalid item provided: The item identifier provided is not valid or it does not exist.

This is the offline programming GUI example from RoboDK that I am experimenting:
# This example shows how RoboDK and the Python GUI tkinter can display graphical user interface to customize program generation according to certain parameters
# This example is an improvement of the weld Hexagon
# More information about the RoboDK API here:
from robodk.robolink import *  # API to communicate with RoboDK
from robodk.robomath import *  # robodk robotics toolbox

# Set up default parameters
PROGRAM_NAME = "DoWeld"  # Name of the program
APPROACH = 300  # Approach distance
RADIUS = 200  # Radius of the polygon
SPEED_WELD = 50  # Speed in mn/s of the welding path
SPEED_MOVE = 200  # Speed in mm/s of the approach/retract movements
SIDES = 8  # Number of sides for the polygon
DRY_RUN = 1  # If 0, it will generate SprayOn/SprayOff program calls, otherwise it will not activate the tool
RUN_MODE = RUNMODE_SIMULATE  # Simulation behavior (simulate, generate program or generate the program and send it to the robot)

# use RUNMODE_SIMULATE to simulate only
# use RUNMODE_MAKE_ROBOTPROG to generate the program
# use RUNMODE_MAKE_ROBOTPROG_AND_UPLOAD to generate the program and send it to the robot

# Main program
def RunProgram():
   # Use default global variables
   global PROGRAM_NAME
   global APPROACH
   global RADIUS
   global SPEED_WELD
   global SPEED_MOVE
   global SIDES
   global DRY_RUN
   global RUN_MODE

   # Any interaction with RoboDK must be done through RDK:
   RDK = Robolink()

   # get the home target and the welding targets:
   home = RDK.Item('Home')
   target = RDK.Item('Target Reference')

   # get the robot as an item:
   robot = RDK.Item('', ITEM_TYPE_ROBOT)

   # impose the run mode
   # set the name of the generated program
   RDK.ProgramStart(PROGRAM_NAME, "", "", robot)

   # get the pose of the reference target (4x4 matrix representing position and orientation):
   poseref = target.Pose()

   # move the robot to home, then to an approach position
   robot.MoveJ(transl(0, 0, APPROACH) * poseref)

   # make an polygon of n SIDES around the reference target
   for i in range(SIDES + 1):
       ang = i * 2 * pi / SIDES  #angle: 0, 60, 120, ...
       # Calculate next position
       posei = poseref * rotz(ang) * transl(RADIUS, 0, 0) * rotz(-ang)

       # Impose weld speed only for the first point
       if i == 0:
           # Set weld speed and activate the gun after reaching the first point
           if not DRY_RUN:
               # Activate the spray right after we reached the first point
               robot.RunCodeCustom("SprayOn", INSTRUCTION_CALL_PROGRAM)

   # Stop the tool if we are not doing a dry run
   if not DRY_RUN:
       robot.RunCodeCustom("SprayOff", INSTRUCTION_CALL_PROGRAM)

   # move back to the approach point, then home:
   robot.MoveL(transl(0, 0, APPROACH) * poseref)

   # Provoke program generation (automatic when RDK is finished)

# Use tkinter to display GUI menus
from tkinter import *

# Generate the main window
root = Tk()
root.title("Program settings")

# Use variables linked to the global variables
runmode = IntVar()
runmode.set(RUN_MODE)  # setting up default value

dryrun = IntVar()
dryrun.set(DRY_RUN)  # setting up default value

entry_name = StringVar()

entry_speed = StringVar()

# Define feedback call
def ShowRunMode():
   print("Selected run mode: " + str(runmode.get()))

# Define a label and entry text for the program name
Label(root, text="Program name").pack()
Entry(root, textvariable=entry_name).pack()

# Define a label and entry text for the weld speed
Label(root, text="Weld speed (mm/s)").pack()
Entry(root, textvariable=entry_speed).pack()

# Define a check box to do a dry run
Checkbutton(root, text="Dry run", variable=dryrun, onvalue=1, offvalue=0, height=5, width=20).pack()

# Add a display label for the run mode
Label(root, text="Run mode", justify=LEFT, padx=20).pack()

# Set up the run modes (radio buttons)
runmodes = [("Simulate", RUNMODE_SIMULATE), ("Generate program", RUNMODE_MAKE_ROBOTPROG), ("Send program to robot", RUNMODE_MAKE_ROBOTPROG_AND_START)]
for txt, val in runmodes:
   Radiobutton(root, text=txt, padx=20, variable=runmode, command=ShowRunMode, value=val).pack(anchor=W)

# Add a button and default action to execute the current choice of the user
def ExecuteChoice():
   global DRY_RUN
   global RUN_MODE
   global SPEED_WELD
   global PROGRAM_NAME
   DRY_RUN = dryrun.get()
   RUN_MODE = runmode.get()
   SPEED_WELD = float(entry_speed.get())
   PROGRAM_NAME = entry_name.get()
   # Run the main program once all the global variables have been set

Button(root, text='Simulate/Generate', command=ExecuteChoice).pack()

# Important to display the graphical user interface

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