Look for "No such file or directory" entries.
Then re-run your report. If the error disappears, your environment language is mismatched. You can either set NLS_LANG permanently or install the required language message files. Rep-0001 Unable To Find The Report Builder Message File
./rwbuilder -m
Look for files like rep .msb (e.g., repus.msb for English) in the $ORACLE_HOME/reports/mesg folder. Look for "No such file or directory" entries
Have you encountered a variation of this error? Share your experience or additional solutions in the comments below. Rep-0001 Unable To Find The Report Builder Message File