1. Identify the root cause of the PostgreSQL XX002 error: The PostgreSQL XX002 error is caused by a syntax error in the SQL query. To identify the root cause of the error, you can use the PostgreSQL log files to find the exact query that is causing the error.

2. Fix the syntax error in the SQL query: Once you have identified the query that is causing the error, you can fix the syntax error by using the PostgreSQL command line interface. For example, if the query is:

SELECT * FROM table_name WHERE column_name = 'value'

You can fix the syntax error by changing the query to:

SELECT * FROM table_name WHERE column_name = 'value';

3. Test the query: Once you have fixed the syntax error, you can test the query by running it in the PostgreSQL command line interface. If the query runs successfully, then the PostgreSQL XX002 error should be fixed.

4. Use an automated database observability tool: To ensure that the PostgreSQL XX002 error does not occur again, it is recommended to use an automated database observability tool. This tool can monitor the performance of the database and alert you when any errors occur. It can also provide detailed insights into the performance of the database, which can help you identify and fix any issues quickly.