I am trying to implement an Oracle database comparison script, using the DBIx::Compare::Oracle module. In the script below, when I un-comment this section, I get no results in the hash

  my $hashref = $oDB_Comparison->get_differences;
  print Dumper \$hashref;
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And when I just call to

  my @aList = $oDB_Comparison->get_tables;
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I get the following error:

DBD::Oracle::st execute failed: ORA-00900: invalid SQL statement (DBD 
+ERROR: OCIStmtExecute) [for Statement "show tables"] at C:/Perl/site/
+lib/DBIx/Compare.pm line 544. DBD::Oracle::st bind_columns failed: St
+atement has no result columns to bind (perhaps you need to successful
+ly call execute first) [for Statement "show tables"] at C:/Perl/site/
+lib/DBIx/Compare.pm line 545. DBD::Oracle::st fetch failed: ERROR no 
+statement executing (perhaps you need to call execute first) [for Sta
+tement "show tables"] at C:/Perl/site/lib/DBIx/Compare.pm line 546.  
+DBD::Oracle::st execute failed: ORA-00900: invalid SQL statement (DBD
+ ERROR: OCIStmtExecute) [for Statement "show tables"] at C:/Perl/site
+/lib/DBIx/Compare.pm line 544. DBD::Oracle::st bind_columns failed: S
+tatement has no result columns to bind (perhaps you need to successfu
+lly call execute first) [for Statement "show tables"] at C:/Perl/site
+/libDBIx/Compar
e.pm line 545.  DBD::Oracle::st fetch failed: ERROR no statement execu
+ting (perhaps you need to call execute fir
st) [for Statement "show tables"] at C:/Perl/site/lib/DBIx/Compare.pm 
+line 546.
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I re-installed DBIx::Compare, and I did not see in the documentation where I have to do an execute statement before calling 'get_tables'. Any/all help would be greatly appreciated! Thank you! T.j. Entire script:

#!/usr/bin/perl 
use strict;
use warnings;
use DBIx::Compare::Oracle;
use DBI;                           # database module
use DBD::Oracle qw(:ora_types);    # database module for oracle
use sys_utils;                     # custom utilities
use Data::Dumper;                  # robust print output mechanism

  # load the database code into the new working directory
  my ( $usr1, $pwd1 ) = getUsrPwdBuildAutomation('MMAD09');
  my $DBH1 = DBI->connect( "dbi:Oracle:$SID", $usr1, $pwd1 )
    || die "Error Connecting to \$dbh1: " . $DBI::errstr . "\n";
  my ($usr2, $pwd2 ) = getUsrPwdBuildAutomation('MMAD02');
  my $DBH2 = DBI->connect( "dbi:Oracle:$SID", $usr2, $pwd2 )
      || die "Error Connecting to \$dbh1: " . $DBI::errstr . "\n";
  # test connection
  my $sth = $DBH2->prepare('SELECT sysdate from dual');
  $sth->execute();
  while ( my @row = $sth->fetchrow_array() ) {
    foreach (@row) {
        $_ = "\t" if !defined($_);
        print "$_\t";
    }
    print "\n";
  }

  my $oDB_Comparison = db_comparison->new( $DBH1, $DBH2 );
  $oDB_Comparison->verbose;
  my @aList = $oDB_Comparison->get_tables;
    #my $hashref = $oDB_Comparison->get_differences;
    #print Dumper \$hashref;
}
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