Hello everyone,

I am trying to reproduce this tutorial using the data I have.

Symphony tutorial

However, when I am mapping the query to the reference,

query = mapQuery(query_exp,   query_metadata,    reference,   do_normalize = TRUE,   do_umap = TRUE)

I get an error saying

Normalizing Scaling and synchronizing query gene expression Found 1795 out of 2000 reference variable genes in query dataset

Error in scaleRowsWithStats_dgc(A@x, A@p, AHughie, mean_vec, sd_vec, ncol(A), : Not compatible with requested type: [type=NULL; target=double].

In addition: Warning message: Unknown or uninitialised column: stddev.

Can you please let me know the possible reason and the solution.