我在安装任何模块时收到以下错误:
> Scanning Package
> Installation failed!
> The package you are attempting
> to install does not conform to the policies established within the
> Sugar Open Cloud or by your system administrator.
> Sugar Open Cloud customers must obtain a new package from the package provider that addresses the issues described below.
> If you are running Sugar locally, you can relax your Module Loader restrictions to allow the package to be installed.
>
> The Sugar Open Cloud package loading policies are detailed in the
> SugarCRM Knowledge Base. The available restrictions and exceptions are
> detailed in the SugarCRM Developer Zone.
> File Issues modules/let_Chat/history.php Invalid usage of a function
> ob_start() modules/let_Chat/elements/sounds/button-19.mp3 Invalid file
> extension modules/let_Chat/elements/sounds/Pop.aiff Invalid file
> extension modules/let_Chat/elements/sounds/button-27.mp3 Invalid file
> extension modules/let_Chat/elements/sounds/button-20.mp3 Invalid file
> extension modules/let_Chat/elements/icons/restore_old.png Invalid
> usage of a function '`' modules/let_Chat/show_chat.php Invalid usage
> of a function $msi1() modules/let_Chat/JSON.php Invalid usage of a
> function array_map() Invalid usage of a function array_map() Invalid
> usage of a function array_map()
请帮我解决问题。