Rep-0001 Unable To Find The Report Builder Message File. Please Verify Your Installation -

Even if the file exists, the operating system may block access.

Windows:

Linux/Unix:

ls -la $ORACLE_HOME/reports/mesg/
chmod 755 $ORACLE_HOME/reports/mesg/
chmod 644 $ORACLE_HOME/reports/mesg/*.msb

Also verify that the disk is not full and that no file system quotas are exceeded.

Environment variables override registry settings. Misconfigured variables are the leading cause of REP-0001. Even if the file exists, the operating system

The most common cause in environments hosting multiple Oracle products (e.g., an Oracle Database and Oracle Developer Suite on the same machine) is the PATH environment variable.

In older versions of Oracle Developer Suite (6i, 9i, 10g), the REPORTS_PATH or FORMS_PATH variables have character limits. If the path string exceeds the buffer limit, the application truncates the path, rendering the location of the message file unreachable. Also verify that the disk is not full

If all else fails:

After reinstallation, test launching Reports Builder immediately before applying any patches. the application truncates the path