Describe the bug to help us solve this issue :)

the UI will show a blank screen when you login to notebook, lab or tree

# How to Reproduce

just install notebook 7

# Expected behavior

what you expected to happen

# Screenshots

add screenshots to help explain your problem

(click F12 on browser to capture console error log)

# Desktop (please complete the following information):

 - OS: [e.g. Windows 10, Mac] 

 - Browser [e.g. chrome, safari]

# VisualPython Information (please complete the following information):

 - Version [e.g. 1.1.0] 

# Additional context

any other context about the problem here.