This is a known issue when deploying applications that use LabVIEW web services with a custom installer created with LabVIEW 2020 or 2020 SP1. In order to fix the issue, you need to install Erlang on the target computer before using the custom installer. Please install this component by clicking Yes
when prompted, this will take you to the Erlang download page and you should be able to follow the process or follow this steps:
1. When prompted to open a browser window to the Erlang download site click on No
and cancel the installation process.
2. Go to the Erlang download
website and download the installer.
3. Run the installer on the deployment pc and follow the instructions to install this component.
4. Relaunch the LabVIEW custom installer and this time the error message should not show up.
5. Finish the installation process.