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If the 'score.txt' file has an error in its format, it could be because of several reasons such as:

1. Incorrect formatting: The file may have been saved in the wrong format or the data might be in the incorrect order.

2. Missing or extra data: The file may have some missing or extra data that is causing the issue.

3. Different encoding: The encoding used to save the file might be different from what the program is expecting, causing the program to incorrectly read the data.

4. Corrupt file: The file may be corrupt, which can cause issues while reading the data from it.

5. Typographical errors: There could have been typographical errors while writing the data to the file, such as using spaces instead of commas, that may be causing issues while reading it.