Oracle Solution for Error ora-48172

Solution for Oracle Error ORA-48172

ORA-48172: unable to find a valid ADR base

What triggered the Error:

Unable to find a valid ADR base. We tried the ORACLE_BASE, ORACLE_HOME, home, and tmp directories, but none of the directories exist for read/write access.

What should we do to fix it:

Check the validity of the ORACLE_BASE, ORACLE_HOME, home, and tmp directories.