what error is this :ORA-06413?

Question

i try to launch my client but this happens

Answer 1

ORA-06413: Connection Not Open

Your connection to your oracle database has not been opened.

Network problems if this was working previously? Is the Server turned on?

Answer 2

This is a connection error. The problem is in the set up of your PC.

This is one possibility

You are starting the application from a directory with a special
character in the name. Remove the special characters from the directory name and everything
will work as designed.