After editing fields and getting an error, the load operation no longer works

[potaotototo]

Problem

As title.

Steps to reproduce

Edit the json file to corrupt the data first.
Edit the json file again to correct the data back to how it was.
Try to load the same json file.

Expected

Should be able to load or show error.

Actual

Loading file from ...

Screenshot

Explanation: the top i first corrupted the data (edited grades in json to become -50)
then i saw error and edited it back to -1, and tried to load the file

Potential improvement

Add error detection / handling

[nus-se-script]

Team's Response

video:https://raw.githubusercontent.com/nus-cs2103-AY2425S1/pe/master/files/91bdfd43-6b31-412e-810e-f7b8032e7062.mp4

The team is unable to reproduce the stated error.

Items for the Tester to Verify

❓ Issue response

Team chose [response.CannotReproduce]

• I disagree

Reason for disagreement: [replace this with your explanation]

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