Fix FailedToGenerateValidJsonError

✅ Solution

The "FailedToGenerateValidJsonError" often arises when attempting to serialize Python objects containing unserializable data types (e.g., custom classes, SQLAlchemy models) directly into JSON. To resolve this, ensure all objects being serialized are primitive types (string, integer, boolean, list, dictionary) or provide custom serialization logic (e.g., using a `default` function in `json.dumps` or converting objects to dictionaries manually) to handle non-serializable attributes. Consider using libraries like `marshmallow` for complex object serialization.