open-source-silicon.dev

I got this error when extracting the lef file and using it with openlane. Openlane claims this error:
```Error: pin vco_2/p[9] not covered by guide
Error: pin vco_2/p[9] not covered by guide
Warning: analog_io[6] 3 pin not visited, fall back to feedrough mode
Error: analog_io[6] 3 pin not visited #guides = 8
Error: critical error guide not connected, exit now 1!```
The design is here: <https://github.com/duck-manh-tran/130nm_project/blob/main/vco_w6_w6/magic/vco_w6_r100.mag>
The command that we use to export the lef in magic is:
```lef writeall```
We have a very old and dirty version that does not have this problem, however, any new design does not work.
Is there any specific requirement to label the nets and create the ports for using with openlane?