Process Error 408 - Timed Out

I wrote a program that does the sum of two numbers. In Output I save the value in a variable → resultVariable. But when I try to launch the app it goes to Timeout Error.


UiPath Studio 2024.10.5

in your log message add .tostring to convert the int32 to string

make sure variables first number and second number are of type int32

suggest to use only one value to store the sum result remove variable sumResult and replace it with the argument

Hi @Stefano_Martucci,
Refer this workflow, it’s working fine
Add.xaml (8.0 KB)


  1. The workflow it’s ok if I do run from UiPath
  2. I build the app with one button and one textbox and I linked the process to the onclick event of the button
  3. But when I try to launch the app it goes to Timeout Error

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