Clicker app doesnt work

Im new to app inventor and ive tried making a clicker app however the app dosent seem to work whenever i want to purchase an upgrade anyone able to help?
FriesClicker.aia (343.3 KB)

First, clear old data in TinyDB with this block:
component_method (4)

Then modify these blocks:

in this way:

If the fries and friesperclick variables have numeric values, then TinyDB should also use numeric values.

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