jQuery : SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data

jQuery : SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data
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jQuery : SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data
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character at JSON.parse: column : jQuery SyntaxError: unexpected of 1 the JSON data line 1