Writing Powershell Error messages to SSIS - powershell

Question

I have an SSIS execute process task where I am calling a PowerShell script. I found that I can get the process task to fail if the PowerShell script fails by trapping the errors like this:
trap {
$err = $_.Exception
while ( $err.InnerException )
{
$err = $err.InnerException
Write-Host $err.Message
};
exit 1
}
I would like to get the error messages to return to SSIS, but I can't seem to get it to work. It just returns the following:
The process exit code was "1" while the expected was "0".
Any help is appreciated.
Full Code:
Param(
[String]$excelPath,
[String]$serverName,
[String]$databaseName,
[String]$tableName
)
$ErrorActionPreference = 'Stop'
[System.Reflection.Assembly]::LoadWithPartialName('Microsoft.SqlServer.SMO') | Out-Null
[System.Reflection.Assembly]::LoadWithPartialName('Microsoft.SqlServer.SMO.SqlDataType') | Out-Null
Trap {
$err = $_.Exception
while ( $err.InnerException )
{
$err = $err.InnerException
Write-Host $err.Message
};
exit 1
}
$excel = New-Object -ComObject excel.application
$excel.visible = $False
$excel.displayalerts=$False
$workbook = $excel.Workbooks.Open($ExcelPath)
$workSheet = $workbook.worksheets.Item(1).name
$workbook.Close()
$excel.quit()
$excel = $null
$query = "select * from [$workSheet`$]";
$connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=`"$excelPath`";Extended Properties=`"Excel 12.0 Xml;HDR=YES`";"
# Instantiate some objects which will be needed
$serverSMO = New-Object Microsoft.SqlServer.Management.Smo.Server($serverName)
$db = $serverSMO.Databases[$databaseName];
$newTable = New-Object Microsoft.SqlServer.Management.Smo.Table ;
$newTable.Parent = $db;
$newTable.Name = $tableName ;
$conn = New-Object System.Data.OleDb.OleDbConnection($connectionString)
$conn.open()
$cmd = New-Object System.Data.OleDb.OleDbCommand($query,$conn)
$dataAdapter = New-Object System.Data.OleDb.OleDbDataAdapter($cmd)
$dataTable = New-Object System.Data.DataTable
$dataAdapter.fill($dataTable)
$conn.close()
# Drop the table if it exists
if($db.Tables.Contains($tableName).Equals($true))
{
($db.Tables[$tableName]).Drop()
}
# Iterate the columns in the DataTable object and add dynamically named columns to the SqlServer Table object.
foreach($col in $dataTable.Columns)
{
$sqlDataType = [Microsoft.SqlServer.Management.Smo.SqlDataType]::Varchar
$dataType = New-Object Microsoft.SqlServer.Management.Smo.DataType($sqlDataType);
$dataType.MaximumLength = 1000;
$newColumn = New-Object Microsoft.SqlServer.Management.Smo.Column($newTable,$col.ColumnName,$dataType);
$newColumn.DataType = $dataType;
$newTable.Columns.Add($newColumn);
}
$newTable.Create();
#bcp data into new table
$connectionString = "Data Source=$serverName;Integrated Security=true;Initial Catalog=$databaseName;"
$bc = New-Object ("Data.SqlClient.SqlBulkCopy") $connectionString
$bc.DestinationTableName = "$tableName"
$bc.WriteToServer($dataTable)