3819641 - Error: Payment confirmation workflow step update failed for report (key)

After I run the Expense Payment Confirmation job, I got the error below. How can I solve this?

• Payment confirmation workflow step update failed for report (key): 46708. Failed to execute queryForObject - id [report.getByPKey], parameterObject [46708]. Cause: java.sql.SQLException: Network error IOException: Too many open files
• Payment confirmation workflow step update failed for report (key): 47744. java.io.FileNotFoundException: /usr/share/apache-tomcat-9.0.21/webapps/cesmidtier/WEB-INF/lib/netty-transport-native-unix-common-4.1.33.Final.jar (Too many open files)
• Payment confirmation workflow step update failed for report (key): 2568 . Failed to update - id [report.insertReportPaymentConf] - parameterObject [{payee=null, rptKey=2568, refNo=214005 [2568-APRIL 2021 EXPENSES], payAmount=488.25, payMethod=null, crnKey=2, empKey=6104, jrKey=997862, isPayeeEmployee=true, payDate=null}]. Cause: com.ibatis.common.jdbc.exception.NestedSQLException: --- The error occurred in com/concur/midtier/data/dao/report.xml. --- The error occurred while applying a parameter map. --- Check the report.insertReportPaymentConf-InlineParameterMap. --- Check the statement (update procedure failed). --- Cause: com.microsoft.sqlserver.jdbc.SQLServerException: Duplicate ref_no.
• Payment confirmation workflow step update failed for report (key): 46700 . Malformed \uxxxx encoding.

Error when trying to import an Expense Payment Confirmation file , KBA , CON-CA-TLS-IEM-JOB , Scheduled Jobs , CON-EXP-ADM-WFL-WL , Workflow , Problem