My company uses flyspeed as a database amnagement query writer. I have no documnetation or er diagram and need to make joins ec to write queries how do I do the without any documentation or help?

I have an explain plan query and I need to call with parameters in my .Net application. When I try it as following it gives me ORA-1780 Error. I have many parameterized queries in my application but this script is not working. How could I fix it?