This is an internal system error, not related directly to SPARK Forms, this is when you call a request between .Net framework and Oracle. SP has nothing to do with this as the call is generated from the .Net as I said and we have many clients integrated their forms with Oracle.
Also you can use the MSSQL linked server feature to connect to Oracle and you can connect to MSSQL instead of Oracle if you were unable to figure out how to solve it.
We don’t interact or support internal integration issues, as this is a very sensitive topic related to external servers other than SP and have many concerns with regards to security and systems stabilities.
So you need to consult with your DBA about the connectivity between servers.
Check this link out:
https://stackoverflow.com/questions/19354015/error-system-data-oracleclient-requires-oracle-client-software-version-8-1-7-or
