So I've rewritten my code and it looks like this:

#!/usr/bin/perl
use Modern::Perl;
use File::Slurp qw/read_file write_file/;

my $uniprot = 'uniprot-sfinal.txt';
my $activin = 'Activator-PFAM.txt';
my $antioxin = 'AntiOxidant-PFAM.txt';
my $toxinin= 'Toxin-PFAM.txt';




my $activout = 'ActivACNPF.txt';
my $antioxout= 'AntioxACNPF.txt';
my $toxinout= 'ToxinACNPF.txt';
my @activline;
my @antioxline;
my @toxinline;

my %activ = map { s/\.\d+//g; $1=>$2 if/(.+)\s+\|\s+(.+)/; } read_file
+ $activin;
my %antiox = map { s/\.\d+//g; $1=>$2 if/(.+)\s+\|\s+(.+)/; } read_fil
+e $antioxin;
my %toxin = map { s/\.\d+//g; $1=>$2 if/(.+)\s+\|\s+(.+)/; } read_file
+ $toxinin;
for ( read_file $uniprot ) {
/(.{6})\s+.+=([^\s]+)/;

push @activline, "$1 | $2 | $activ{$1}\n" if $activ{$1};
push @antioxline, "$1 | $2 | $antiox{$1}\n" if $antiox{$1};
push @toxinline, "$1 | $2 | $toxin{$1}\n" if $toxin{$1};

}
write_file $activout, @activline;
write_file $antioxout, @antioxline;
write_file $toxinout, @toxinline;
[download]

The error codes changed. Now they say this.

Odd number of elements in hash assignment at ARP//positivedatasetextra
+ctor.pl line 18.
Odd number of elements in hash assignment at ARP//positivedatasetextra
+ctor.pl line 20.
Odd number of elements in hash assignment at ARP//positivedatasetextra
+ctor.pl line 23.
Odd number of elements in hash assignment at ARP//positivedatasetextra
+ctor.pl line 24.
Odd number of elements in hash assignment at ARP//positivedatasetextra
+ctor.pl line 25.
[download]

The lines with the errors are still the same.

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