The following error occurred in PseudobulkExpression.Seurat(object = object, assays = assays,:
   None of the requested assays are present in the object.

The above error occurs. Below is the code I ran:

cts <- AggregateExpression(seurat_from_cds,
                           group.by = c("Cell.Type", "Samples"),
                           assays = "originalexp",
                           slot = "Counts",
                           return.seurat = F)

How can I solve this error?

Thank you for help!