my icc2 annot initilize floorplan , why？

icc2_shell> initialize_floorplan -control_type die -core_utilization 0.5 -shape R -orientation N -side_ratio {1.0 1.0} -core_offset {0} -flip_first_row true -origin_offset {10 10}-coincident_boundary true
Removing existing floorplan objects
Creating core...
Error: Can't create core area. (DPI-203)
Error: cannot create core area. (DPI-091

please check the command initialize_floorplan
mine is something like this:
initialize_floorplan -core_utilization 0.6 -flip_first_row -left_io2core 80.0 -bottom_io2core 80.0 -right_io2core 80.0 -top_io2core 80.0