Network tool App issue after upgrading splunk to 9.1.0.2

[walidnazzal]

We had upgraded our Splunk instance from version 8.2.6 to 9.1.0.2 but after the upgrade some dashboards aren't working in Network Tools App and we see the followings errors:

Status Overview DashBoard does show any output:

When i executed the the SPL command for Dashbard Status Overview i got the following errors

and i saw this warning in splunkd.log file:
09-06-2023 10:49:12.903 -0400 WARN SearchOperator:kv [4093676 TcpChannelThread] - Invalid key-value parser, ignoring it, transform_name='hydra_access_log_fields'.
09-06-2023 10:49:12.904 -0400 WARN SearchOperator:kv [4093676 TcpChannelThread] - Invalid key-value parser, ignoring it, transform_name='hydra_gateway_log_fields'.
09-06-2023 10:49:12.904 -0400 WARN SearchOperator:kv [4093676 TcpChannelThread] - Invalid key-value parser, ignoring it, transform_name='hydra_scheduler_log_fields'.
09-06-2023 10:49:12.904 -0400 WARN SearchOperator:kv [4093676 TcpChannelThread] - Invalid key-value parser, ignoring it, transform_name='pool_name_field_extraction'.
09-06-2023 10:49:12.904 -0400 WARN SearchOperator:kv [4093676 TcpChannelThread] - Invalid key-value parser, ignoring it, transform_name='hydra_worker_log_fields'.
09-06-2023 10:49:12.931 -0400 WARN SearchOperator:kv [4093676 TcpChannelThread] - Invalid key-value parser, ignoring it, transform_name='pool_name_field_extraction'.
09-06-2023 10:49:12.953 -0400 WARN SearchOperator:kv [4093676 TcpChannelThread] - Invalid key-value parser, ignoring it, transform_name='hydra_logger_fields'.

Could you please help us to resolve this issue.