Uncaught TypeError: Cannot read properties of undefined (reading 'filter')

This error message indicates that you are trying to access the "filter" property of an undefined value. This can happen when you try to use the "filter" method on a variable that has not been properly initialized or defined.

To fix this error, you should check that the variable you are trying to use the "filter" method on is not undefined. If it is undefined, you will need to initialize it with the appropriate value before using the "filter" method.

For example, if you are trying to filter an array, you should check that the array is not undefined before using the "filter" method:

if (myArray !== undefined) {
// use the filter method on myArray
}

Alternatively, you can use a conditional statement to check if the variable is defined before using it:

if (typeof myVariable !== 'undefined') {
// use the filter method on myVariable
}

By checking that the variable is defined before using it, you can avoid the "Cannot read properties of undefined" error.