toString and uiString error: app is not giving a recommendations

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I am making an app that is used to give the user a recommended element after they input what they are looking for, within the element. Everything is working, besides the recommendations at the end. The box stays empty and these two errors appear. I’ll link my app below.

https://studio.code.org/projects/applab/rTKOvTc9QDnXk15TEmKHq_XUjV15j3FraK2Kx9liP-k

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