Thank you for your message.
Here is the basic version:
Oracle Database 11g Enterprise Edition Relase 220.127.116.11.0 - 64it Production
Here is the driver version ODAC112040Xcopy_32bit
with the set of .dll:
The web service project works by itself and also when I have included it in another project.
Now, I wanted to deploy the web service so that those who want to use it so they can reference it through the URL of this web service.
But the same error message !!!