I am new here and trying to establish connection to the server, which was provided by client. The problem is that I have a .bat file which should be launched before the connection itself. I have spent almost a 2 days, however did not find a solutions for the sequence of different errors starting with ORA-12541: TNS: no listener and then POWERBI - Object reference not set to an instance of an object
It would be a really great pleasure if somebody could help with configuration of TNSNAMES.ORA files as far as I understood problems in those tnsnames.ora files.