Do you mean Spindleclutch? That is a group dungeon, aimed at groups of 4 players. If you are experienced in playing your class, you'll be able to solo it (and many, but not all, of the other group dungeons), but in general they are not meant to be soloed.
That goes for all the dungeons you can also queue for in the group finder.
FrancisCrawford wrote: »My wife soloed that one before Level 40 -- but her character had good gear, good food, and max CP. It would be much, much harder on one's first character.