While trying to upgrade by running upgrade.sh build is getting failed with below exception.

  [java] 2021-08-18 17:53:11,466 (                  SQLLoaderInternal)    INFO - Starting on /turtle-reserved/tmp/schema/generated/postgres/update/statements

     [java] 2021-08-18 17:53:11,480 (                  ConnectionWrapper)    INFO - Attempting to load profile "install.postgres": 

     [java] 2021-08-18 17:53:11,481 (                  ConnectionWrapper)    INFO - Type: postgres

     [java] 2021-08-18 17:53:11,482 (                  ConnectionWrapper)    INFO - Class: org.postgresql.Driver

     [java] 2021-08-18 17:53:11,482 (                  ConnectionWrapper)    INFO - URL: jdbc:postgresql://vpce-018a31a1ce598623e-sdczmtua.vpce-svc-0ed30df23b7d33bf6.us-west-2.vpce.amazonaws.com:8194/mfldev01

     [java] 2021-08-18 17:53:11,483 (                  ConnectionWrapper)    INFO - User: pegaadmin

     [java] 2021-08-18 17:53:11,483 (                  ConnectionWrapper)    INFO - JDBC Properties: 

     [java] 2021-08-18 17:53:11,734 (                  ConnectionWrapper)    INFO - Autocommit set to true

     [java] 2021-08-18 17:53:11,737 (                  SQLLoaderInternal)    INFO - File: postgres00010.sql

     [java] 2021-08-18 17:53:11,738 (                  SQLLoaderInternal)    INFO - DROP FUNCTION DATA.SPPR_PURGE_TABLE(VARCHAR,VARCHAR,INT)

     [java] 2021-08-18 17:53:11,743 (                  SQLLoaderInternal)    INFO - Failed to execute SQL in file postgres00010.sql

     [java] 

     [java] org.postgresql.util.PSQLException: ERROR: function data.sppr_purge_table(character varying, character varying, integer) does not exist

     [java] at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2552)

     [java] at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:2284)

     [java] at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:322)

     [java] at org.postgresql.jdbc.PgStatement.executeInternal(PgStatement.java:481)

     [java] at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:401)

     [java] at org.postgresql.jdbc.PgStatement.executeWithFlags(PgStatement.java:322)

     [java] at org.postgresql.jdbc.PgStatement.executeCachedSql(PgStatement.java:308)

     [java] at org.postgresql.jdbc.PgStatement.executeWithFlags(PgStatement.java:284)

     [java] at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:279)

     [java] at com.pega.pegarules.install.SQLLoaderInternal.readAndExecuteSQLStatements(SQLLoaderInternal.java:160)

     [java] at com.pega.pegarules.install.SQLLoaderInternal.load(SQLLoaderInternal.java:119)