Static Rail Analysis Problem

Hello,

I am doing a static rail analysis for a small design. I am getting a following error and warning in-spite of properly defining the proper power pin, power net, ground pin and ground net:

Analyze Rail Settings:
Temp directory: /tmp/ssv_tmpdir_161280_bh1R11
Output directory: /home/suhas/Desktop/genus_invs_des/staticRailResults
Run directory: /home/suhas/Desktop/genus_invs_des/staticRailResults/ALL_0C_avg_8/
Begin Merging Power Grid for net VSS
** WARN: (VOLTUS_RAIL-4022): The cell type "macro" didn't match any cell in cell libraries.
** WARN: (VOLTUS_RAIL-4022): The cell type "io" didn't match any cell in cell libraries.
** WARN: (VOLTUS_RAIL-4016): No interface node connections present in top-level PGDB.
Merging cell power views for net VSS
Merged power views for 0 cells
Processed 0 cell internal tap current sources.
Processed 0 cell internal resistors.
EM: 0 IR: 0 Early: 0 Tech: 0 Unused: 1

** WARN: (VOLTUS_RAIL-4065): The following 1 cells do not have connection from
the power pins to the global grid VSS, no powergrid library will be used.
AND
Ended Merging Power Grid for net VSS: (cpu=0:00:01, real=0:00:02, mem(process/total)=40.28MB/758.92MB)

Merge Grid Statistics:

VSS: 0 cells
EM: 0 IR: 0 Early: 0 Tech: 0 Unused: 1

Begin Merging Power Grid for net VDD
** WARN: (VOLTUS_RAIL-4076): The net VDD is marked as incomplete net

Merge Grid Statistics:

** WARN: (VOLTUS_RAIL-2091): Found incomplete net, VSS, it will be skipped in the analysis and the report.
** WARN: (VOLTUS_RAIL-2091): Found incomplete net, VDD, it will be skipped in the analysis and the report.
** ERROR: (VOLTUS_RAIL-1259): Failed to run domain based rail analysis - required at least one power net and one ground net. Only 0 nets () found, the other nets (VSS, VDD) are incomplete.
*** Error: In processing command script
Rail Analysis failed.

1 error was found while processing the file /tmp/ssv_tmpdir_161280_bh1R11/voltus_rail_161280.cmd

Rail Analysis Statistics:
Warning messages: 5
Error messages: 2

Rail Analysis is unsuccessful due to errors.

Finished Rail Analysis at 12:29:33 09/18/2017 (cpu=0:00:02, real=0:00:05, peak mem=758.92MB)
Current Voltus IC Power Integrity Solution resource usage: (total cpu=0:00:21, real=0:01:10, mem=718.73MB)
voltus_rail exited unsuccessfully.
**ERROR: (PRL-387): "Rail Analysis" failed to finish successfully.

Please let me know where I am going wrong, the design is a small AND gate power and rail analysis.

Regards

Suhas.S