Hii

i dont know which odoo version you are use but there is few step to solve the error 
Step 1: Activate Developer Mode

Step 2: Find the Broken Template

1. Go to Technical > User Interface > Views
2. search for 

​Inherited View: website_sale.cart

You’ll likely see customized or inherited views overriding the default.

Disable or Delete Custom/Inheriting View(s)

1. Identify the inherited/custom view overriding website_sale.cart
2. Either:
   • Unlink (delete) it
   • OR Uncheck "Active" to disable it
3. Save your changes

i hope it is use full