error in download in front-end

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Notice: Undefined index: mask in C:\xampp\htdocs\opencart\catalog\controller\account\download.php on line 61

Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\opencart\catalog\controller\account\download.php:61) in C:\xampp\htdocs\opencart\system\library\response.php on line 65

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$size = filesize(DIR_DOWNLOAD . $result['mask']);

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$size = filesize(DIR_DOWNLOAD . $result['mask']);

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$size = filesize(DIR_DOWNLOAD . $result['filename']);