"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.