I am facing an error when i execute the task through input dialouge box

Help Studio
1

26.0.188-cloud.22252+Branch.release-s188.Sha.0e963c82108b60a5b59b17985655444bf8c9094a.0e963c82108b60a5b59b17985655444bf8c9094a

Source: Input Dialog

Message: Object reference not set to an instance of an object.

Exception Type: System.NullReferenceException

in Main.xaml
at InputDialog “Input Dialog”
at Sequence “Sequence”
at Sequence “Sequence”
at Main “Main”

Below is the error

System.NullReferenceException: Object reference not set to an instance of an object.
at UiPath.Core.Activities.InputDialog.Execute(CodeActivityContext context)
at System.Activities.CodeActivity.InternalExecute(ActivityInstance instance, ActivityExecutor executor, BookmarkManager bookmarkManager)
at System.Activities.Runtime.ActivityExecutor.ExecuteActivityWorkItem.ExecuteBody(ActivityExecutor executor, BookmarkManager bookmarkManager, Location resultLocation)

Can anyone please help me with this

2

@umesh.pillai1 It means the Input Dialog activity is getting a null value in one of its properties.

Please check these once:

Title is not empty/null

Label / message text is not null

Options collection is not null if you are using list/dropdown mode

default value is not coming from an uninitialized variable
If the activity was working before, try replacing that Input Dialog with a fresh one

3

Hi @umesh.pillai1

Pls ensure all fields have actual values: set Title, Label, and Placeholder as non‑empty strings, initialize the Options list before assigning it, and map the Result to a valid string variable.

Happy Automation

4

Thank you for your reponse, let me try

5

I am still getting the same error

image
image461×368 19.2 KB

6

image
image519×122 8.65 KB

7

@umesh.pillai1 I checked this with my system which is working.

Please show me the variable pannel. Also, is there any other acitivity on main.xaml. Please share me SS

image
image2043×1476 147 KB

8

image
image1251×191 14.5 KB

Here is teh screenshot

9

There is no other activity, i was just trying to practice what i learned, but stuck with this

10

@umesh.pillai1 please share me the SS of maim.xaml workflow

11

image
image1908×1031 116 KB

12

@umesh.pillai1 From the screenshot the configuration looks correct. I tested the same setup and it is working on my side.

One thing you can try is removing the Input Dialog and adding a new one again, then map the Result to the same Prompt variable.

Also check once:

  • Clear cache and run or
  • try running it in a new blank project just to confirm

Sometimes the activity gets corrupted in the workflow and recreating it fixes the issue.

13

Hi~我遇到跟你一樣的問題
不過在【Options String】填入預設值(我是填 “”)，讓他型態是String後就可以順利執行了!

14

Hello @umesh.pillai1,

There is an issue with the System activities version. Please upgrade UiPath.System.Activities to v26.2.3

Thanks,
Karthik