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Without seeing the code, it is difficult to determine the exact cause of the error. However, a "Fatal error: Uncaught PDOException" typically means that there is an issue with the PHP Data Objects (PDO) extension. Common causes include:
- Incorrect or missing database credentials
- Issues with the database itself (such as a table or column that doesn't exist)
- Problems with the PDO driver (such as an outdated or missing driver)
- Coding errors, such as trying to execute a PDO statement before establishing a connection to the database.
Double-check your code for any of these potential issues and ensure that your server environment meets the requirements for using the PDO extension.