Having a weird problem with perl/Moose.

Calling a writer for an attribute in a class to set the attribute value, but as far as I can tell the writer doesnt actually get called. The problem is with the call to SetFleName on line 15.

Here is the calling code

use lib 'C:\Users\Jay\Desktop\SBS DEV\CODE\perl\Utilities';
use AXControl;
use AXSQL;
use AXField;
use Moose;
use DBI;
use DocPart;

    my ($cntl,$dp, $i, $rc); 

    $cntl = AXControl->new(System => "paperless");
    $dp = DocPart->new(ControlObject => $cntl, DocID => 1, Seq => 1);
    
    print "bef call\n";
    $rc = $dp->SetFileName('C:\Users\Jay\Desktop\SBS DEV\CODE\perl\tes
+t scripts\testdoc_part.pl');
    print "set filename $rc\n";
    

    my $x = $dp->Save;
    print "save rc $x\n";
    print "Err msg " . $dp->ErrMsg;
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Here is the code for the doc part object

package DocPart;

# Our libraries
use lib 'C:\Users\Jay\Desktop\SBS DEV\CODE\perl\Utilities';
use AXControl;
use AXRecord;

use Moose;
use DBI;

# Attributes
has 'ControlObject' => (is => 'rw', isa => 'Object', required => 1);
has 'DocID' => (is => 'rw', isa => 'Num', writer => 'SetDocID');
has 'Seq' => (is => 'rw', isa => 'Num', writer => 'SetSeq');
has 'FileName' => (is => 'rw', isa => 'Str', writer => 'SetFileName');
has 'Rec' => (is => 'rw', isa => 'Object');
has 'Valid' => (is => 'rw', isa => 'Bool');
has 'ErrMsg' => (is => 'rw', isa => 'Str');

#private - should not be accessed by outside code
has 'NewDocPart' => (is => 'rw', isa => 'Bool');

sub BUILD
{
    
    my ($self, $db);
    
    $self = shift;
    $self->Valid(0);
    if (defined($self->DocID) and defined($self->Seq))
        {
        $self->Rec( AXRecord->new(ControlObject => $self->ControlObjec
+t, Name => 'document_part', Where => "WHERE DOC_ID = " . $self->DocID
+ . " AND SEQNO = " . $self->Seq));
        $self->NewDocPart(0);
        }
    else
        {
        $self->Rec( AXRecord->new(ControlObject => $self->ControlObjec
+t, Name => 'document_part'));
        $self->NewDocPart(1);
        }
        
}    

sub SetDocID
{
    my $self;
    
    $self->DocID = shift;
    
    $self->get;
}

sub SetSeq
{
    
    my $self;
    
    $self->Seq = shift;
    
    $self->get;
}

sub get
{
    my ($self, $Where);
    
    if ($self->ControlObject->IsNumber($self->DocId) and $self->Contro
+lObject->IsNumber($self->Seq))    
        {
        $Where = "WHERE DOC_ID = " . $self->DocID() . " AND SEQNO = " 
+. $self->Seq();
        $self->Rec->Select(Where => $Where);
        if ($self->Rec->Populated()) 
            {
            $self->NewDocPart(0);
            $self->Valid(1);
            $self->FileName($self->Rec->GetField("FILENAME"));
            }
        }    
    
}

sub Validate
{
    my $self;
    
    $self = shift;
    $self->Valid(1);
    $self->ErrMsg(" ");
    
    if ( not $self->ControlObject->IsNumber($self->DocID)) 
        {
        $self->Valid(0);
        $self->ErrMsg("DocID is non numeric");
        }
    
    if (not $self->ControlObject->IsNumber($self->Seq)) 
        {
        $self->Valid(0);
        $self->ErrMsg("Seq is non numeric");
        }
        
    if (not $self->Rec->Populated() and $self->Rec->GetField("FILENAME
+")->Value eq " " )
        {
        $self->Valid(0);
        $self->ErrMsg("Filename required for new document.");
        }
    else
        {
        if (not -e $self->FileName)
            {
            $self->Valid(0);
            $self->ErrMsg("File named does not exist.");
            }
        }
    
}

sub Save
{
    
    my ($SQLStr, $sql, $self);
    
    $self = shift;
    
    $self->Validate;
    if ($self->Valid)
        {
        if ($self->Rec->Populated)
            {
            #Existing Record 
            if ($self->Rec->GetField("FILENAME")->Value ne $self->Rec-
+>GetField("FILENAME")->OriginalValue)
                {
                #First delete any existing segments for this document 
+part
                $SQLStr = "DELETE FROM doc_part_segment WHERE DOC_ID =
+ " . $self->DocID . " AND SEQNO = " . $self->Seq;
                $sql = AXSQL->new(ControlObject => $self->ControlObjec
+t, SQLString => $SQLStr); 
            
                # load new file
                $self->LoadFile
                }
            $self->Rec->Update;
            }
        else
            {
            #load new file
            $self->Rec->Insert;
            $self->LoadFile;
            }
        return 1;
        }
    else
        {
        return 0;
        }
    
}    

sub SetFileName
{
    my ($self, $fn);
    $self = shift;
    $fn = shift;
    
    print "fn $fn\n";
    
    if (not -e $fn)
        {
        print "ret 0\n";
        return 0;
        }
    else 
        {
        $self->Rec->GetField("FILENAME")->NewValue($fn);
        $self->FileName($fn);
        print "ret 1\n";
        return 1;
        }
    
}

sub LoadFile
{
    my $self;
    
    #read the file, split it into segments of the appropriate size and
+ load to the db
    my ($maxlen, $db, $sql, $cnt, $data);
    
    open FILE, "<" . $self->Rec->GetField("FILENAME") or die "cant ope
+n file " . $self->Rec->GetField("FILENAME");
    
    #need to get this from the db next
    $maxlen = 1000;
    
    $db = $self->ControlObject->{"SysHandle"};
    $sql = $db->prepare(qq{INSERT INTO doc_part_segment (DOC_ID, SEQNO
+, SEGMENT_NO, FILE_SEGMENT) VALUES(?,?,?,?)});
    read FILE, $data, $maxlen;
    $cnt = 1;
    while($data)
        {
        $sql->execute($self->DocID, $self->Seq, $cnt, $data);
        read FILE, $data, $maxlen;
        $cnt++;
        }
    close FILE;
    
}
1;
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Here is the output I get (I've left out the majority of the moose messages)

SQL select column_name, column_key, character_maximum_length, numeric_
+scale, data_type, numeric_precision, datetime_precision from informat
+ion_schema.columns where table_schema = 'paperless' and table_name = 
+'document_part' order by ordinal_position
SQL RowCount 4
SQL SELECT * FROM document_part WHERE DOC_ID = 1 AND SEQNO = 1
SQL RowCount 0
bef call
set filename C:\Users\Jay\Desktop\SBS DEV\CODE\perl\test scripts\testd
+oc_part.pl
save rc 0
Err msg Filename required for new document.
C:\Users\Jay\Desktop\SBS DEV\CODE\perl\test scripts>
[download]

What am I doing wrong?