java.sql.SQLException: UCP-29: Failed to get a connection

Summary:

OIC getting this error often when call to private Oracle ATP PL/SQL call execution

Internal Exception: java.sql.SQLException: UCP-29: Failed to get a connection
Error Code: 29
Check to ensure that the XML containing parameter data matches the parameter definitions in the XSD. This exception is considered retriable, likely due to a communication failure.
UCP-29: Failed to get a connection

cross checked with ATP database as such no load at ATP, all looks normal.

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

26.01

Code Snippet (add any code snippets that support your topic, if applicable):