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One possible reason for encountering a JSON reading error for a table in BigQuery is that the JSON file or data may contain invalid syntax or formatting issues. This can cause BigQuery to fail to read the data correctly and generate an error message.

To fix this issue, you can try the following steps:

1. Check the JSON file or data for any syntax errors or formatting issues. Use a JSON validator tool to identify and fix any issues.

2. Ensure that the JSON data is in the correct format and follows the schema of the BigQuery table. If the data does not match the table schema, it may cause errors during reading.

3. Verify that the data source is properly connected and authorized to access the BigQuery table.

4. Make sure that the data source and BigQuery table are both in the same region. If they are in different regions, it may cause errors during data transfer.

If none of these steps resolve the issue, you can contact the BigQuery support team for further assistance.