What does "ng100: expression has changed after" mean when the last item is used in ngFor?

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This error message indicates that the expression used in the ngFor loop has been modified after its last item. This can happen if the array being looped through is changed while the loop is still running, causing unexpected behavior or errors. To fix this issue, you can try to avoid modifying the array while the loop is running, or use a different approach to update the array that does not interfere with the ngFor loop.