RMAN-03009: failure of backup command due to ORA-27038 and OSD-04010:
You must add unicity variable in the backup format name:
 backup incremental level 0 format 'F:\DATABASE_BACKUP\%d\%Y-%M-%D\FULL_%d_%T_%t_%U' database ;
As your backupset is composed of multiple backup pieces, they must have different names.