Notice 0: Reading LEF file:  /project/openlane/user_proj_example/runs/16-12_10-43/tmp/merged.lef
Notice 0:     Created 13 technology layers
Notice 0:     Created 25 technology vias
Notice 0:     Created 438 library cells
Notice 0: Finished LEF file:  /project/openlane/user_proj_example/runs/16-12_10-43/tmp/merged.lef
Notice 0: 
Reading DEF file: /project/openlane/user_proj_example/runs/16-12_10-43/results/routing/user_proj_example.def
Notice 0: Design: user_proj_example
Notice 0: error: unknown library cell referenced (obs_core_obs_0) for instance (obs_core_obs_0)
Notice 0: 		Created 100000 Insts
Notice 0: 		Created 200000 Insts
Notice 0: 		Created 300000 Insts
Notice 0: 		Created 400000 Insts
Notice 0: 		Created 500000 Insts
Notice 0: 		Created 600000 Insts
Notice 0: 		Created 700000 Insts
Notice 0: 		Created 800000 Insts
Notice 0: 		Created 900000 Insts
Notice 0: 		Created 100000 Nets
Notice 0:     Created 606 pins.
Notice 0:     Created 927490 components and 4240852 component-terminals.
Notice 0:     Created 2 special nets and 0 connections.
Notice 0:     Created 192139 nets and 731343 connections.
Notice 0: Finished DEF file: /project/openlane/user_proj_example/runs/16-12_10-43/results/routing/user_proj_example.def
Top-level design name: user_proj_example
Found port VPWR of type SIGNAL
Found port VGND of type SIGNAL
Power net:  VPWR
Ground net: VGND
Modified power connections of 927490 cells (Remaining: 0 ).