Hi I am trying to follow the tutorial of Monocle, but I have some problems.

While running the code,

valid_cells <- row.names(subset(pData(HSMM),
                            Cells.in.Well == 1 &
                              Control == FALSE &
                              Clump == FALSE &
                              Debris == FALSE &
                              Mapped.Fragments > 1000000))

This keeps giving me an error : Error in eval(e, x, parent.frame()) : object 'Cells.in.Well' not found

I tried to change to Cells %in% Well but it also says that object "Cells" is not found.

Please help me with this!