When RSM attempted to eject the media in drive %1 of library %2, the drive reported that it contained no media. Most likely, ...

When RSM attempted to eject the media in drive %1 of library %2, the drive reported that it contained no media.  Most likely, the drive rejected the media when RSM originally placed the media into it.  This situation is usually caused when incompatible media or a cleaner cartridge is placed in a library with a door access or inject operation.