Unable to Add Items to Cart in Enatega Multivendor Customer App

Description:
Users are encountering a critical issue in the Enatega Multivendor Customer App where they are unable to add items to their shopping cart.

Steps to Reproduce:
Open the Enatega Multivendor Customer App.
Browse the product catalog and select any item.
Attempt to add the selected item to the shopping cart.

Expected Behavior:
The selected item should be added to the shopping cart, and the cart icon should reflect the updated item count.

Observed Behaviour:
Upon attempting to add an item to the cart, users are encountering an error, and the selected item is not added to the cart. The cart count remains unchanged.

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No source file, test, or entry point is identified in the issue. Start by reproducing the add-to-cart failure in the Enatega Multivendor Customer App and inspect the reported error. Done means a selected product is added successfully and the cart icon shows the updated item count.

Written by the indexing model from the issue text.