Error when generating bulk

[SimJohal]

Hi,

I am going through the tutorial and I am encountering this error:
Error: unable to find an inherited method for function ‘ExpressionSet’ for signature ‘assayData = "matrix"’

when running either of these lines of code: `## (1) using all single cells

pseudo.seger <- [generateBulk_allcells](https://meichendong.github.io/SCDC/reference/generateBulk_allcells.html)(qc.seger$sc.eset.qc, ct.varname = "cluster", sample = "sample", ct.sub = [c](https://rdrr.io/r/base/c.html)("alpha","beta","delta","gamma"))

## (2) using random proportions of single cells
pseudo.seger.rand <- [generateBulk_norep](https://meichendong.github.io/SCDC/reference/generateBulk_norep.html)(qc.seger$sc.eset.qc, ct.varname = "cluster", sample = "sample", ct.sub = [c](https://rdrr.io/r/base/c.html)("alpha","beta","delta","gamma"), nbulk = 3)

I am using the data supplied in the vigentte.

Any help would be appreciated! Thanks!