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ORA-09924:

Can't spawn process - core dump directory not created properly
Cause: ORACLE was unable to spawn a background process because the directory that holds the core dumps produced by ORACLE processes in the event of exceptions was not created properly.
Action: Examine the directory pointed to by the initialization parameter "core_dump_dest". Make sure that all of the following is true:

1. The directory exists.

2. The name indeed points to a directory, and is not a file.

3. The directory is accessible and writable to the ORACLE user.