Errors when invoking dc_shell-t

I got the following errors when I invoke dc_shell-t while dc_shell is OK. If I logged in as root, the errors disappear. I guess it's something about TCL routines. Anyone know how to correct it?

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Copyright (c) 1988-2002 by S**opsys, Inc.
ALL RIGHTS RESERVED

This program is proprietary and confidential information of S*nopsys, Inc.
and may be used and disclosed only as authorized in a license agreement
controlling such use and disclosure.

Initializing...
Error: Cannot create procedure named 'group_variable' - existing command
Use error_info for more info. (CMD-013)
Error: Procedure 'group_variable' cannot be modified. (CMD-051)
Error: ::group_variable
Use error_info for more info. (CMD-013)
Error: Cannot create procedure named 'print_variable_group' - existing command
Use error_info for more info. (CMD-013)
Error: Procedure 'print_variable_group' cannot be modified. (CMD-051)
Error: :rint_variable_group
Use error_info for more info. (CMD-013)
Error: Cannot create procedure named 'read_verilog' - existing command
Use error_info for more info. (CMD-013)
Error: Procedure 'read_verilog' cannot be modified. (CMD-051)
Error: ::read_verilog
Use error_info for more info. (CMD-013)
Error: Cannot create procedure named 'read_vhdl' - existing command
Use error_info for more info. (CMD-013)
Error: Procedure 'read_vhdl' cannot be modified. (CMD-051)
Error: ::read_vhdl
Use error_info for more info. (CMD-013)
Error: Cannot create procedure named 'read_db' - existing command
Use error_info for more info. (CMD-013)
Error: Procedure 'read_db' cannot be modified. (CMD-051)
Error: ::read_db
Use error_info for more info. (CMD-013)
Error: Cannot create procedure named 'read_edif' - existing command
Use error_info for more info. (CMD-013)
Error: Procedure 'read_edif' cannot be modified. (CMD-051)
Error: ::read_edif
Use error_info for more info. (CMD-013)
Error: could not open command log file "./log/command.log" (CMD-015)
dc_shell-t>

dc_shell log

which version are you running?

dc_shell-t

1) man ...., then you will find ...
Error: Cannot create procedure named 'abc_xyz' - existing command
Use error_info for more info. (CMD-013)
Error: Procedure 'abc_xyz' cannot be modified. (CMD-051)
Error: ::abc_xyz

=> Just follow the prompt ...
Use error_info for more info. (CMD-013)
dc_shell-t> man CMD-013

=> It seems that you are going to re-define the Tcl procedure abc_xyz 8O

2) Access right
Error: could not open command log file "./log/command.log" (CMD-015)

=> It seems that you are running the dc_shell-t under the directory
that is not able to be written by current user name !!!

=> Check the ownership of the working directory, and you will see

dc shell error cmd-015

I am using 2002.05 on RH7.3.
Once again, if I logged in as root, everything is Ok.

Here is what I got after error_info. It doesn't help much.
..................
Error: Procedure 'read_edif' cannot be modified. (CMD-051)
Error: ::read_edif
Use error_info for more info. (CMD-013)
dc_shell-t> error_info
Extended error info:
::read_edif
while executing
"define_proc_attributes read_edif -info " Read one or more edif files" -permanent -define_args {
{file_names "Files to read" file_nam..."
-- End Extended Error Info
dc_shell-t>