{ "code": 50001, "message": "invalid character '<' looking for beginning of value", "data": {} }

This error message typically indicates that the response from an API is not in the expected format. The '<' character suggests that the response may be in HTML format, rather than JSON or another expected format.

To resolve this issue, you may need to check the API documentation to ensure you are using the correct endpoint and parameters. You may also want to check the response headers to ensure the content type is set correctly.

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invalid character 'ï' looking for beginning of value

This error message occurs when there is an invalid character in the JSON data being parsed. Specifically, the error indicates that the parser is looking for the opening quotation mark that starts a JSON value, but instead found the character 'ï', which is not a valid JSON character.

This error can occur for a few different reasons. One possibility is that the data being parsed contains non-ASCII characters that are not properly encoded. Another possibility is that there is an issue with the way the JSON data is being generated, such as a bug in the code that is generating the JSON.

To fix this error, you will need to identify the source of the invalid character and correct it. This may require examining the data being parsed, checking the encoding of the data, and reviewing the code that is generating the JSON. Once the issue has been identified and fixed, the JSON should be able to be parsed without error.

"invalid character '[' looking for beginning of object key string"

This error message typically indicates that there is an issue with the syntax of a JSON object. Specifically, it means that there is a "[" character that is not being used properly. In JSON, "[" is used to indicate the beginning of an array, not the beginning of an object key string.

To resolve this issue, you should review the JSON code and look for any instances where "[" is being used incorrectly. Make sure that all arrays are properly formatted and that object keys are being defined with a string value.