Let's follow up this discussion at the Neptune Community
(this forum will be kept in read-only mode)
If you ever run an app and in the browser's console you get the following error message:
'sap' is undefined
After installing Neptune UX Platform (SAINT/SPAM), the 'Post Installation' activities of the Installation Guide asks you to run app: /NEPTUNE/ADMIN by using Neptune Application Designer. This step is needed just one time and then you can consider the installation complete.
So please try opening App /NEPTUNE/NAM in Display mode using Neptune Application Designer,
After that, click on “Run in browser” and problem fixed.
Finally, please ensure if all the ICF nodes under /Neptune are active ? (specially /Neptune/public )