Add Order Page Add Product Option Returns Nothing while this plugin is active

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After installing this plugin, when I went to orders->add order in admin panel and I typed first three letters to select customer, it returned loading failed… Similar thing happened with Add product in same page… When I disabled this plugin, it worked properly. The URL of the page I am talking about is as follows:
http://www.mydomain123.com/wp-admin/post-new.php?post_type=shop_order

This plugin disables the add order section entirely as we are not able to add products or customers.
Can you suggest a fix here? Or you may release the next stable version of your plugin.

Thanks in Advance.