Hi Akshay,
First of all thank you for providing us this plug-in.
I myself am experiencing an error after updating the plugin to v1.4.0.
Menus are successfully exported but cannot be imported.
Error Message “Uploaded file is either Empty or not a valid JSON file”.
Copy of the file is in pastebin https://pastebin.com/BRCCxGsz
Thanks again,
Gerry