soc encounter-sdc file error

Hi friends

Iam working on cadence soc encounter.

Iam using the technology library from OSU AMI 0.5 u 

Consider the following vhdl code for byte multipleser

...............................................................................

library ieee;
use ieee.std_logic_1164.all;
 
entity bytemux is
port(       md : in std_logic_vector(31 downto 0);
            sd : in std_logic_vector(31 downto 0);
            be : in std_logic_vector(3 downto 0);
     bytedata : out std_logic_vector(31 downto 0));
end bytemux;
....................................... ...................................

i have the follwing sdc file

set sdc_version 1.5
# Set the current design
current_design bytemux

set_wire_load_mode "enclosed"
set_max_dynamic_power 450 uW

...................................................................

My RTL import was successful in soc encounter 8.1

But when i tried the RTL synthesis i get the following error

____________________________________________________________

Statistics for commands executed by read_sdc:
 "current_design"          - successful      1 , failed      0 (runtime  0.00)
 "set_max_dynamic_power"   - successful      1 , failed      0 (runtime  0.00)
 "set_wire_load_mode"      - successful      1 , failed      0 (runtime  0.00)
Total runtime 0

EC INFO: Total cpu-time and memory after CONSTRAINT: 8 sec., 25.32 MBytes.

Error   : A required object parameter could not be found. [TUI-61] [path_group]
        : An object of type 'instance|external_delay|clock|port|pin' named '' could not be found.
        : Check to make sure that the object exists and is of the correct type.  The 'what_is' command can be used to determine the type of an object.
  path_group: assigns certain paths to a cost group

Usage: path_group [-mode <mode>]
           [-from <instance|external_delay|clock|port|pin>+]
           [-through <instance|port|pin>+]+
           [-to <instance|external_delay|clock|port|pin>+] [-paths <string>]
           [-setup] [-hold] [-name <string>] -group <cost_group>
 

Can somebody let me know where the error is

I think i made a simple syntax error somewhere