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

Updated Apr 13, 2023

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?


This was an error exclusive for LabVIEW 2019. Please update to LabVIEW 2019 SP1 or newer to solve this.

If you are not able to update your software and need to keep using LabVIEW 2019, please try the following steps: 

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: