Видео ютуба по тегу Uncaught Typeerror: Cannot Read Properties Of Undefined (Reading 'Tostring')

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TypeError Cannot read properties of undefined reading 39 toString 39 apex charts

TypeError: Cannot read properties of undefined (reading 'createdTimestamp')

Cannot read properties of undefined (reading 'toString')

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TypeError Cannot read properties of undefined reading 39 toString 39 apex charts

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Why do I get Cannot read property 'toString' of undefined

TypeError: Cannot read property 'onAuthStateChanged' of undefined

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