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This topic is split from https://wpml.org/forums/topic/json-receive-fails-with-404/
This thread is resolved. Here is a description of the problem and solution.
Problem: Uncaught TypeError: Argument 1 passed to WPML_Cornerstone_Register_Strings:" Solution: https://wpml.org/forums/topic/i-added-15-pages-to-translation-basket-15-showing-but-the-basket-page-is-empty/#post-3310413
Specifically this: 2. Can you temporarily disable the Cornerstone plugin before trying to remove the items from the basket?