@servers is an array, it returns more than one value, ... try $servers[0] or use something else

Also see diagnostics

$ perl -we " qq{\@@foo} "
Possible unintended interpolation of @foo in string at -e line 1.
Useless use of string in void context at -e line 1.
Name "main::foo" used only once: possible typo at -e line 1.

$ perl -Mdiagnostics -we " qq{\@@foo} "
Possible unintended interpolation of @foo in string at -e line 1 (#1)
    (W ambiguous) You said something like '@foo' in a double-quoted st
+ring
    but there was no array @foo in scope at the time.  If you wanted a
    literal @foo, then write it as \@foo; otherwise find out what happ
+ened
    to the array you apparently lost track of.

Useless use of string in void context at -e line 1 (#2)
    (W void) You did something without a side effect in a context that
+ does
    nothing with the return value, such as a statement that doesn't re
+turn a
    value from a block, or the left side of a scalar comma operator.  
+Very
    often this points not to stupidity on your part, but a failure of 
+Perl
    to parse your program the way you thought it would.  For example, 
+you'd
    get this if you mixed up your C precedence with Python precedence 
+and
    said

        $one, $two = 1, 2;

    when you meant to say

        ($one, $two) = (1, 2);

    Another common error is to use ordinary parentheses to construct a
+ list
    reference when you should be using square or curly brackets, for
    example, if you say

        $array = (1,2);

    when you should have said

        $array = [1,2];

    The square brackets explicitly turn a list value into a scalar val
+ue,
    while parentheses do not.  So when a parenthesized list is evaluat
+ed in
    a scalar context, the comma is treated like C's comma operator, wh
+ich
    throws away the left argument, which is not what you want.  See
    perlref for more on this.

    This warning will not be issued for numerical constants equal to 0
+ or 1
    since they are often used in statements like

        1 while sub_with_side_effects();

    String constants that would normally evaluate to 0 or 1 are warned
    about.

Name "main::foo" used only once: possible typo at -e line 1 (#3)
    (W once) Typographical errors often show up as unique variable nam
+es.
    If you had a good reason for having a unique name, then just menti
+on it
    again somehow to suppress the message.  The our declaration is
    provided for this purpose.

    NOTE: This warning detects symbols that have been used only once s
+o $c, @c,
    %c, *c, &c, sub c{}, c(), and c (the filehandle or format) are con
+sidered
    the same; if a program uses $c only once but also uses any of the 
+others it
    will not trigger this warning.
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