[R] what is this warnings ?

[sagarnikam123]

i am running one script for many files,
Script file atttached:-
http://r.789695.n4.nabble.com/file/n4556770/AR_anarkali_aic.r
AR_anarkali_aic.r 
& warnings are given as below
what is meaning of these warnings?

Warning messages:
1: In optim(coef, err, gr = NULL, hessian = TRUE, ...) :
  one-diml optimization by Nelder-Mead is unreliable:
use "Brent" or optimize() directly

is there anything wrong with my code or my approach to calculate AIC values
?
how i know due to which function warnings is generated?
if i want to print warnings with file name then ...........?

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