[ns] giving an error statement like as under

[manishsingh chaudhary]

hi
to all,

*sub- the following  giving an error statement like as under:-
*
*invalid command name "1index"
    while executing
"1index $argv 0"
    invoked from within
"set val(nn)             [1index $argv 0]           "



please sort out above error.***
*

with regards
manish
*