Power Analysis failure...

As I do the static power analysis after Post Route it results in error as:
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Constructing power graph for P/G net VDD ...
INFO (SOCPARA-4303): Using voltage 1.98 V for all instances of net VDD.
For Net VDD Instance Voltage Values:
472 instances at 1.98 V
Reading TCF netFreq.tcf...
found 54 nets have switching information out of total 532 nets
**WARN: Only 10.15% of nets have toggling information from TCF
Please check if top module is correct or add -top <module> option
**ERROR: Failed to find any DC Source reference node for this VDD net.
*** Power analysis (cpu=0:00:00.1 mem=237.3M) ***
ERROR (SOCPARA-2056): Check error messages for power net VDD

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Please let me know where am I going wrong?

Thanks All!
Jitendra

it seems the power source is not connected!

In which tool you are seeing these errors..

Hello All!

Its Cadence SoC encounter ver5.2.

Thanks!