ETL Query Error - extraction->numexprs < MAX_COLS

Hello, Would like to know what this error means, please refer below to the message displayed when query is ran via ETL Manager error: Assert code: 1000 context: *extraction->numexprs < MAX_COLS- query: 68021318 location: pg_utils.cpp:727 process: padbmaste [pid=4599] -- Details: com.amazon.redshift.util.RedshiftException https://datacentral.a2z.com/dw-platform/servlet/dwp/template/DWPJobPerformanceHistory.vm/job_id/24400543