The following is the ORA-21520 error message, you can learn the cause and solution of the Oracle database error.
ORA-21520 database server driver not installed
Cause: User attempted to access a database server through an object-mode OCI environment but the necessary driver for supporting such access to the database server is not installed or linked in.
Solution: Check if the driver corresponding to the database server has been installed/linked in and entered in the server driver table.
Please wait for the update…