Error When Using Prompt User for Input Express VI in LabVIEW 2019

Updated Oct 15, 2019

Reported In


  • LabVIEW 2019

Issue Details

I want to use the Prompt User for Input Express VI in LabVIEW 2019. However, when I go to use it in LabVIEW 2019 I am seeing unexpected behavior when trying to add additional inputs. The behavior that I am expecting to see is shown in the image below. For example, if I add items to the Inputs list such input 1 or input 2, I expect to see them populate in the Prompt User for Input Express VI (as shown in orange font below).

However, in LabVIEW 2019 when I add additional items to the Inputs list, the Prompt User for Input VI does not populate them as shown in the orange font above. Instead after selecting OK in the Configure Prompt User for Input dialog box the VI only shows Enable and Error as selections.

My application worked when I used a previous version of LabVIEW. Additionally, I can open my LabVIEW VI that contains this Express VI (that was saved in a previous version of LabVIEW) in LabVIEW 2019 and it will run fine. How do I fix this so I can use the Prompt User for Input VI in LabVIEW 2019?


Note: CAR# 739464 has already been created to document and address this issue. It's expected that this issue will be fixed for LabVIEW 2019 SP1

The temporary solution for this issue is: 
1. Close LabVIEW 2019 (if it is open).
2. Go to the next  path in your computer:
C:\Program Files (x86)\National Instruments\LabVIEW 2019\vi.lib\express\express input
3. Copy the file named as PromptUserBlock to another location in your computer and renamed it. For example, old_PromptUserBlock.
4. Download the file attached to this document and replace the PromptUserBlock located in the express input folder.
5. Run LabVIEW 2019 again and check if the outputs of the Express VI appear this time.

If this doesn't work, these are the current workarounds when using the Prompt User for Input Express VI in LabVIEW 2019:
  • Create a subVI containing the Prompt User for Input Express VI in a working previous version of LabVIEW and use this subVI in your 2019 LabVIEW application.
  • Use a previous version of LabVIEW such as LabVIEW 2018 SP1 (or before)
  • Follow the Creating Quality Dialog Boxes in LabVIEW tutorial to use alternative VIs in your 2019 LabVIEW application