wrtong datatype ina array

[tn_prasad]

i'm working with postnuke.& trying to upload something from postnuke(infact i have added some code for upload-easy uploads form bealers ..) my code is below given..
now when i include the upload pgm call the function as upload($file_up) where file_up is the name of my field in html
(<input type=file name=file_up>)
i get an error like
warning:wrong datatype for second argument in call to in_array in upload.php line no 71.
& the file u have tried to upload is not allowed.
the line in code its pointing out is

\"\"if (!in_array($the_file_type,$allowed_types1)){
echo\"the file u have tried to upload is not allowed.\";

But when i run this file saperately it works fine. plz respond me to [e-mail]

function validate_upload($file_up) {
$allowed_types1= array(\"text/plain\");

global $my_max_file_size, $image_max_width, $image_max_height,$allowed_types1,$the_file_type,$registered_types;

    $start_error = \"\\n<b>Error:</b>\\n<ul>\";

    if ($file_up == \"none\") { # do we even have a file?

            $error .= \"\\n<li>You did not upload anything!</li>\";

    } else { # check if we are allowed to upload this file_type

            if (!in_array($the_file_type,$allowed_types1)) {
                    $error .= \"\\n<li>The file that you uploaded was of a type that is not allowed, you are only 
                                            allowed to upload files of the type:txt files only\\n<ul>\";
                    //while ($type = current($allowed_types1)) {
                            //$error .= \"\\n<li>\" . $registered_types[$type] . \" (\" . $type . \")</li>\";
                             //next($allowed_types1);
            //      }
            //      $error .= \"\\n</ul>\";
            }

            if (ereg(\"image\",$the_file_type) && (in_array($the_file_type,$allowed_types1))) {

                    $size = GetImageSize($file_up);
                    list($foo,$width,$bar,$height) = explode(\"\\\"\",$size[3]);

                    if ($width > $image_max_width) {
                            $error .= \"\\n<li>Your image should be no wider than \" . $image_max_width . \" Pixels</li>\";
                    }

                    if ($height > $image_max_height) {
                            $error .= \"\\n<li>Your image should be no higher than \" . $image_max_height . \" Pixels</li>\";
                    }

            }

            if ($error) {
                    $error = $start_error . $error . \"\\n</ul>\";
                    return $error;
            } else {
                    return false;
            }
    }

} # END validate_upload

--

/*function list_files() {

global $the_path;

    $handle = dir($the_path);
    print \"\\n<b>Uploaded files:</b><br>\";
    while ($file = $handle->read()) {
            if (($file != \".\") && ($file != \"..\")) {
                    print \"\\n\" . $file . \"<br>\";
       }
    }
    print \"<hr>\";

}*/

--

function upload($file_up) {

global $the_path,$the_file_name;

    $error = validate_upload($file_up);
    if ($error) {
            form($error);
    } else { # cool, we can continue
            if (!@copy($file_up, $the_path . \"/\" . $the_file_name)) {
                    form(\"\\n<b>Something barfed, check the path to and the permissions for the upload directory</b>\");
            } else {
                    //list_files();
                    //form();

echo \"file uploaded\";