Cannot read properties of undefined reading data

javascript - TypeError: Cannot read properties of undefined (reading set)  - Stack Overflow

Вопросы и ответы

The error can be fixed by creating a variable to hold the name of the file. This will fix the error and will not change anything in your application.
The “cannot read property of undefined” error essentially means that the browser could not understand the expression used. This can happen for many reasons. One of the reasons for this is that the code is not being executed due to a syntax error in the code.
Breaking down the Message. TypeError: Cannot read properties of undefined (reading 'id') In older browsers, this might also be shown as: Cannot read property 'id' of undefined. TypeError is a subset of JavaScript Error that is thrown when code attempts to do something that does not exist on the target object.
In plain terms, the error occurs when you try to map over an undefined value, such as an array that has not been initialized or has not yet received data.
There are a few ways to fix an undefined variable: (1) You can rename the variable or variable set so that it matches what you have used in the topic; (2) you can re-insert the variable in the topic so that it uses an existing variable set/variable name, (3) you can add the undefined variable to the project as a new ...

How To Fix Uncaught TypeError: Cannot read properties of undefined - JavaScript Debugging

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