AttributeError: 'NoneType' object has no attribute 'json' Possible source of error: frappe_whatsapp (app)

[aqilmujahidiin]

hello, I am a frappe_whatsapp user and this is a very good application, here I get an error when clicking the trigger to send a WhatsApp message, which appears as in the following image

used for sending message when doc.status= apporved

output error as below:

AttributeError: 'NoneType' object has no attribute 'json'
Possible source of error: frappe_whatsapp (app)

[aqilmujahidiin]

the problem is when i included date

when i removed it, no error

[medsun88]

For the error
Migrate the site using the below command and check after that

bench --site [sitename] migrate