What does the duckdb conversion error message "Could not convert 'CHINA' to UNIT8" mean?

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This error message suggests that there was an attempt to convert the string value "CHINA" to a numerical type of UNIT8, but the conversion failed. It could be because the value "CHINA" is not a valid input for a UNIT8 type, or there might be some data formatting or input errors in the conversion process. It is recommended to check the data type requirements and ensure the correct input format before attempting the conversion again.