title: vtiger crm 5.4.0 custom module installation shows Sorry! Attempt to access restricted file
body: <p>I am in developing of a custom module in Vtiger CRM 5.4.0 .when i installing the newly developed  custom module at some server it shows a message  'Sorry! Attempt to access restricted file.' and i can't install the module.</p>
  
  <p>Please help me rectify this issue.</p>