```File "/openlane/scripts/write_powered_def.py", ...
# openlane
k
Copy code
File "/openlane/scripts/write_powered_def.py", line 95, in <module>
    assert VDD_PORTS and GND_PORTS, "No power ports found at the top-level. "\
AssertionError: No power ports found at the top-level. Make sure that they exist and have the USE POWER|GROUND
ort.