sharepoint – Power Automate: Parse JSON Action: Schema Validation Failed?

I’m facing this issue:

Power Automate: Parse JSON Action: Schema Validation Failed:

Used the following article to check if a field changes:

But got the issue in the Parse JSON Action like below.

The following is the error message in general:

Action ‘Parse_JSON’ failed

The following is the internal actions error messages, more detailed.

'''
[
  {
    "message": "Invalid type. Expected String but got Null.",
    "lineNumber": 0,
    "linePosition": 0,
    "path": "d.results[1].Title",
    "schemaId": "#/properties/d/properties/results/items/properties/Title",
    "errorType": "type",
    "childErrors": []
  },
  {
    "message": "Invalid type. Expected String but got Null.",
    "lineNumber": 0,
    "linePosition": 0,
    "path": "d.results[1].Comments",
    "schemaId": "#/properties/d/properties/results/items/properties/Comments",
    "errorType": "type",
    "childErrors": []
  },
  {
    "message": "Invalid type. Expected String but got Null.",
    "lineNumber": 0,
    "linePosition": 0,
    "path": "d.results[1].EstimatedCompletionDate",
    "schemaId": "#/properties/d/properties/results/items/properties/EstimatedCompletionDate",
    "errorType": "type",
    "childErrors": []
  }
]
'''

This is the fix for me:
I removed the fields that the error message complained about and it fixed. I was only interested in one field.