pgAdmin4 connecting to Greenplum Community Edition v6.4 shows error

Recently I tried to connect pgAdmin4 4.20 (running under Windows 10 desktop) to a Greenplum Community Edition Cluster (obained from https://github.com/greenplum-db/gpdb/releases) but I get some error messages in the database log.

For example:

2020-04-17 10:06:31.526219 CST,"gpadmin","postgres",p156239,th996268160,"192.168.3.184","64720",2020-04-17 09:44:53 CST,0,con64694,cmd1295,seg-1,,,,sx1,"ERROR","42703","column ""current_query"" does not exist",,,,,,"/*pga4dash*/
SELECT 'session_stats' AS chart_name, row_to_json(t) AS chart_data
FROM (SELECT
   (SELECT count(*) FROM pg_stat_activity WHERE datid = 16399 ) AS ""Total"",
   (SELECT count(*) FROM pg_stat_activity WHERE current_query NOT LIKE '<IDLE>%' AND datid = 16399 )  AS ""Active"",
   (SELECT count(*) FROM pg_stat_activity WHERE current_query LIKE '<IDLE>%' AND datid =  16399 )  AS ""Idle""
) t
UNION ALL
SELECT 'tps_stats' AS chart_name, row_to_json(t) AS chart_data
FROM (SELECT
   (SELECT sum(xact_commit) + sum(xact_rollback) FROM pg_stat_database WHERE datname = (SELECT datname FROM pg_database WHERE oid = 16399)) AS ""Transactions"",
   (SELECT sum(xact_commit) FROM pg_stat_database WHERE datname = (SELECT datname FROM pg_database WHERE oid = 16399)) AS ""Commits"",
   (SELECT sum(xact_rollback) FROM pg_stat_database WHERE datname = (SELECT datname FROM pg_database WHERE oid = 16399)) AS ""Rollbacks""
) t
UNION ALL
SELECT 'ti_stats' AS chart_name, row_to_json(t) AS chart_data
FROM (SELECT
   (SELECT sum(tup_inserted) FROM pg_stat_database WHERE datname = (SELECT datname FROM pg_database WHERE oid = 16399)) AS ""Inserts"",
   (SELECT sum(tup_updated) FROM pg_stat_database WHERE datname = (SELECT datname FROM pg_database WHERE oid = 16399)) AS ""Updates"",
   (SELECT sum(tup_deleted) FROM pg_stat_database WHERE datname = (SELECT datname FROM pg_database WHERE oid = 16399)) AS ""Deletes""
) t
UNION ALL
SELECT 'to_stats' AS chart_name, row_to_json(t) AS chart_data
FROM (SELECT
   (SELECT sum(tup_fetched) FROM pg_stat_database WHERE datname = (SELECT datname FROM pg_database WHERE oid = 16399)) AS ""Fetched"",
   (SELECT sum(tup_returned) FROM pg_stat_database WHERE datname = (SELECT datname FROM pg_database WHERE oid = 16399)) AS ""Returned""
) t
UNION ALL
SELECT 'bio_stats' AS chart_name, row_to_json(t) AS chart_data
FROM (SELECT
   (SELECT sum(blks_read) FROM pg_stat_database WHERE datname = (SELECT datname FROM pg_database WHERE oid = 16399)) AS ""Reads"",
   (SELECT sum(blks_hit) FROM pg_stat_database WHERE datname = (SELECT datname FROM pg_database WHERE oid = 16399)) AS ""Hits""
) t
",218,,"parse_relation.c",3361,

2020-04-17 10:06:53.047897 CST,"gpadmin","postgres",p156239,th996268160,"192.168.3.184","64720",2020-04-17 09:44:53 CST,0,con64694,cmd1301,seg-1,,,,sx1,"ERROR","42703","column ""procpid"" does not exist",,,,,,"/*pga4dash*/
SELECT
    procpid AS pid,
    datname,
    usename,
    application_name,
    client_addr,
    to_char(backend_start, 'YYYY-MM-DD HH24:MI:SS TZ') AS backend_start,
    CASE WHEN current_query LIKE '<IDLE>%' THEN 'idle' ELSE 'active' END AS state,
    CASE WHEN waiting THEN 'yes' ELSE 'no' END AS waiting
FROM
    pg_stat_activity
WHERE
    datid = 16399 ORDER BY pid",25,,"parse_relation.c",3361,
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