Error - Web Services - No access rights in module context

by Usaamah Patel.  

Hi I am running the following code in PHP (Curl), However on execution of the code below:

<?php

$curlint = curl_init();

curl_setopt($curlint,CURLOPT_URL,'http://localhost/Project/moodle/webservice/rest/server.php?wstoken=cc1a302430c43a8b2df5bfee7d4ebc56&wsfunction=mod_assign_get_grades&assignmentids[0]=1&moodlewsrestformat=json');

$run = curl_exec($curlint);

curl_close($curlint);

if (empty($run)){

      print "Nothing returned from url.<p>";

  }

  else{

      print $run;

  }

?>

I get the following error:

{"assignments":[],"warnings":[{"item":"assignment","itemid":1,"warningcode":"1","message":"No access rights in module context"}]}1

I have had a look at the assignment id in the mod_assign table in the database and it shows as 1, I have no idea where I am going wrong?