Invalid file type! error on option file upload

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$allowed = array();
$filetypes = explode(',', $this->config->get('config_upload_allowed'));

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if (isset($this->request->files['file']['name']) && $this->request->files['file']['name']) {
			if ((strlen(utf8_decode($this->request->files['file']['name'])) < 3) || (strlen(utf8_decode($this->request->files['file']['name'])) > 128)) {
        		$json['error'] = $this->language->get('error_filename');
	  		}	  	
			
			$allowed = array();
 			$filetypes = explode(',', $this->config->get('config_upload_allowed'));
			
			foreach ($filetypes as $filetype) {
				$allowed[] = trim($filetype);
			}
			
			if (!in_array(substr(strrchr($this->request->files['file']['name'], '.'), 1), $allowed)) {
				$json['error'] = $this->language->get('error_filetype');
       		}	
						
			if ($this->request->files['file']['error'] != UPLOAD_ERR_OK) {
				$json['error'] = $this->language->get('error_upload_' . $this->request->files['file']['error']);
			}
		} else {
			$json['error'] = $this->language->get('error_upload');
		}
		
		if (($this->request->server['REQUEST_METHOD'] == 'POST') && !isset($json['error'])) {
			if (is_uploaded_file($this->request->files['file']['tmp_name']) && file_exists($this->request->files['file']['tmp_name'])) {
				$file = basename($this->request->files['file']['name']) . '.' . md5(rand());
				
				// Hide the uploaded file name sop people can not link to it directly.
				$this->load->library('encryption');
				
				$encryption = new Encryption($this->config->get('config_encryption'));
				
				$json['file'] = $encryption->encrypt($file);
				
				move_uploaded_file($this->request->files['file']['tmp_name'], DIR_DOWNLOAD . $file);
			}
						
			$json['success'] = $this->language->get('text_upload');
		}	
		

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$allowed = array(
	'image/jpeg',
	'image/pjpeg',
	'image/png',
	'image/x-png',
	'image/gif',
	'image/x-icon',
	'application/x-shockwave-flash'
);

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$allowed = array(
	'.jpg',
	'.jpeg',
	'.gif',
	'.png',
	'.ico',
	'.flv'
);

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$allowed = array(
	'.jpg',
	'.jpeg',
	'.png',
	'.ico',
	'.gif'
);

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image/photoshop
image/x-photoshop
image/psd
application/photoshop
application/psd
zz-application/zz-winassoc-psd

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$allowed = array(
					'image/jpeg',
					'image/pjpeg',
					'image/png',
					'image/x-png',
					'image/gif',
					'image/photoshop',
					'image/x-photoshop',
					'image/psd',
					'application/x-shockwave-flash',
					'application/photoshop',
					'application/psd',
					'zz-application/zz-winassoc-psd'
				);

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text/plain
image/png
image/jpeg
image/gif
image/bmp
image/vnd.microsoft.icon
image/tiff
image/svg+xml
image/photoshop
image/x-photoshop
image/psd
image/vnd.adobe.photoshop
application/zip
application/x-zip
application/octet-stream
application/zip-compressed
application/x-zip-compressed
application/x-compressapplication/x-rar-compressed
application/x-msdownload
application/vnd.ms-cab-compressed
audio/mpeg
application/pdf
application/postscript
application/msword
application/rtf
application/vnd.ms-excel
application/vnd.ms-powerpoint
application/vnd.oasis.opendocument.text
application/vnd.oasis.opendocument.spreadsheet
application/photoshop
application/psd
zz-application/zz-winassoc-psd
video/quicktime
video/quicktime