如何使用消息'参数0：类型不匹配来解决异常'com_exception'。 '在COM中（“Word.Application”）

I have try catch statement in php, but after running I am getting some error saying

exception 'com_exception' with message 'Parameter 0: Type mismatch. ' in C:\Program Files (x86)\EasyPHP-DevServer-13.1VC9\data\localweb\AutomationDocumentation\doccreation.php:218 Stack trace: #0 C:\Program Files (x86)\EasyPHP-DevServer-13.1VC9\data\localweb\AutomationDocumentation\doccreation.php(218): variant->Open(false) #1 {main}

below is my code:

try{
   $word = new COM("Word.Application") or die ("Could not initialise Object.");
   // set it to 1 to see the MS Word window (the actual opening of the document)
   $word->Visible = 0;
   echo "Anish";
   $path=realpath("C:\Program Files (x86)\EasyPHP-DevServer-13.1VC9\data\localweb\AutomationDocumentation/$releasedoc/$releasedocfile.docx");
   //echo $path;
   // recommend to set to 0, disables alerts like "Do you want MS Word to be the default .. etc"
   $word->DisplayAlerts = 0;
   // open the word 2007-2013 document 
   $word->Documents->Open($path);
   $a="hello";
   // convert word 2007-2013 to PDF
  $word->ActiveDocument->ExportAsFixedFormat("C:\Program Files (x86)\EasyPHP-DevServer-13.1VC9\data\localweb\AutomationDocumentation\$created/$mainfolder/$releasedoc/$releasedocfile.pdf", 17, false, 0, 0, 0, 0, 7, true, true, 2, true, true, false);
   // quit the Word process
   $word->Quit(false);
   // clean up
   unset($word);
}catch(Exception $e){
   echo $e;
}