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Some antivirus programs quarantine .msb files because they contain executable bytecode. Check your antivirus quarantine log. If found, restore the files and add an exclusion for %ORACLE_HOME%\reports\mesg\*.msb . : Some antivirus programs quarantine
The "REP-0001: Unable to find the report builder message file" error is rarely a sign of unrecoverable database corruption; rather, it is a configuration disconnect between the application and the operating system hosting it. By understanding that Oracle Reports depends heavily on external message files mapped through system variables, administrators can quickly pinpoint the disconnect. Systematically checking environment paths, verifying the physical presence of .msb files, and auditing user permissions will resolve the vast majority of REP-0001 errors and restore operational capacity to the Oracle reporting environment. The "REP-0001: Unable to find the report builder
– Create set_reports_env.bat (Windows) or set_reports_env.sh (Linux) to define ORACLE_HOME , NLS_LANG , PATH , LD_LIBRARY_PATH , and REPORTS_PATH before launching Reports Builder. – Create set_reports_env