Issues with Generating Elbow Plot

[mannakade]

Hello

I've been having issues generating an elbow plot via multi modal vignette, I'm not sure how to reframe the bounds further or if I'm supposed to compound specify arrays within the cbmc dataframe

cbmc <- RunPCA(cbmc, verbose = FALSE, npcs = 3, approx = FALSE)
Warning: No assay specified, setting assay as RNA by default.
ElbowPlot(cbmc@'cell.embeddings', ndims = 4)
Error in UseMethod(generic = "Stdev", object = object) :
no applicable method for 'Stdev' applied to an object of class "c('matrix', 'array', 'double', 'numeric')"
ElbowPlot(cbmc, ndims = 4)
Warning: The following arguments are not used: reduction
Error in embeddings[i, j, drop = drop, ...] : subscript out of bounds
ElbowPlot(cbmc@'feature.loadings', ndims = 4)
Error in UseMethod(generic = "Stdev", object = object) :
no applicable method for 'Stdev' applied to an object of class "c('matrix', 'array', 'double', 'numeric')"
ElbowPlot(object= c(cbmc@'cell.embeddings', 'cbmc@stdev'), ndims = 4)
Error in UseMethod(generic = "Stdev", object = object) :
no applicable method for 'Stdev' applied to an object of class "character"
ElbowPlot(object= c(cbmc@'cell.embeddings', 'cbmc@stdev', cbmc@'feature.loadings'), ndims = 4)
Error in UseMethod(generic = "Stdev", object = object) :
no applicable method for 'Stdev' applied to an object of class "character"