Notice 0: Reading LEF file:  /project/openlane/user_project_wrapper/runs/user_project_wrapper/tmp/merged.lef
Notice 0:     Created 13 technology layers
Notice 0:     Created 25 technology vias
Notice 0:     Created 439 library cells
Notice 0: Finished LEF file:  /project/openlane/user_project_wrapper/runs/user_project_wrapper/tmp/merged.lef
Notice 0: 
Reading DEF file: /project/openlane/user_project_wrapper/runs/user_project_wrapper/results/routing/user_project_wrapper.def
Notice 0: Design: user_project_wrapper
Notice 0: error: unknown library cell referenced (obs_core_obs_2) for instance (obs_core_obs_2)
Notice 0: error: unknown library cell referenced (obs_core_obs_1) for instance (obs_core_obs_1)
Notice 0: error: unknown library cell referenced (obs_core_obs_0) for instance (obs_core_obs_0)
Notice 0:     Created 644 pins.
Notice 0:     Created 1 components and 606 component-terminals.
Notice 0:     Created 8 special nets and 0 connections.
Notice 0:     Created 636 nets and 604 connections.
Notice 0: Finished DEF file: /project/openlane/user_project_wrapper/runs/user_project_wrapper/results/routing/user_project_wrapper.def
Top-level design name: user_project_wrapper
Found port vccd1 of type SIGNAL
Found port vssd1 of type SIGNAL
Power net:  vccd1
Ground net: vssd1
Modified power connections of 1 cells (Remaining: 0 ).