Why "watch" node display null?

Packages
1

problem.dyn (11.9 KB)

Capture
Capture.png1862×742 78.9 KB

Revit 2017 & Dynamo 1.2.1.3083
“Shortest.Walk” node from LunchBox PKG.

2

Hi @Jia_Duanmu

Try Restarting Dynamo and run. If its still shows you null uninstall 1.2.1 and download latest dynamo 1.3.1.