WGCNA Error in moduleEigengenes: setting key from pcagrey to pcagrey_

Question

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I am not sure what this error mean and what can I do about it? I am using this code:

ModuleEigengenes( seurat_obj, group.by.vars = NULL, modules = NULL, vars.to.regress = NULL, scale.model.use = "linear", verbose = TRUE, assay = NULL, pc_dim = 1, exclude_grey = FALSE, wgcna_name = NULL, ... ) Error: (converted from warning) Keys should be one or more alphanumeric characters followed by an underscore, setting key from pcagrey to pcagrey_