Witness the following:

$ perl -Mstrict -Mdiagnostics -E 'my $a = "3"; say $a->[0];'
Can't use string ("3") as an ARRAY ref while "strict refs" in use at -
+e line 1 (#1)
    (F) You've told Perl to dereference a string, something which
    use strict blocks to prevent it happening accidentally.  See
    "Symbolic references" in perlref.  This can be triggered by an @ o
+r $
    in a double-quoted string immediately before interpolating a varia
+ble,
    for example in "user @$twitter_id", which says to treat the conten
+ts
    of $twitter_id as an array reference; use a \ to have a literal @
    symbol followed by the contents of $twitter_id: "user \@$twitter_i
+d".
    
Uncaught exception from user code:
    Can't use string ("3") as an ARRAY ref while "strict refs" in use 
+at -e line 1.
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If you are getting this message, then your code is doing what my code demonstrates. It may take a more complex path to get there, but the result it the same; some variable that you think has an array reference in it actually has the string "3", and you are attempting to dereference it.

You will need to show the code that gives that error

Fixed it , bad data, thank you!

We can do this with sort and uniq commands in Unix. Keep all the data in file and try below commands

cat 1.txt|sort |uniq -c
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Output would be 1 Jane B,. Squere Rd., House 1 3 John Doe, Main Street, House 1 2 Maria D., Pat street, House B 4 Mary Lou, Central Street, House 1 the numbers before name are the number of houses the person has I can still provide you the output in required format using awk