Model Builder Iterator problem

[WersusBarckowich]

Hello!
I try to process each band of Landsat scene in Model Builder using Iterator:

I can't give name to output rasters.
I tried:
C:\Users\Admin\Documents\ArcGIS\Default.gdb\%Name%
and
C:\Users\Admin\Documents\ArcGIS\Default.gdb\F%Name%
But I have error:
ERROR 999999: Error executing function.
The table name is invalid.
No spatial reference exists.
ERROR 010302: Unable to create the output raster: C:\Users\Admin\Documents\ArcGIS\Default.gdb\FL5015041_04119930905_B10.TIF
ERROR 010067: Error in executing grid expression.
Failed to execute (Float).

What am I doing wrong?
Thanks!

[CaglarKoylu]

I don't know what exactly causing this but I had the same issue and it worked when I saved it into a folder rather than the geodatabase. Also, watch out the filename I think it must be less than 13 characters.