Ever since the new update came up, this error always pop up
Anybody know how to fix this?
Thank you
Just as the dialog said, you need to add voltage source
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Brand new interactions and interfaces.
Smooth support for design sizes of over 3W
devices or 10W pads.
More rigorous design constraints, more
standardized processes
For enterprises, more professional users.
Easy to use and quick to get started.
The process supports design scales of 300
devices or 1000 pads.
Supports simple circuit simulation.
For students, teachers, creators.
Brand new interactions and interfaces. 
Easy to use and quick to get started. 
Just as the dialog said, you need to add voltage source
