Error in "cb.directi.fit_DIRECTi()" function

[IvyYang00]

Hi CellBLAST team!

I want to annotate a very low scRNA-seq dataset with CellBlast, which is only about 60 cells in it. I encountered an error when run cb.directi.fit_DIRECTi() function. Here are the error details.

Is it because the number of cells in the dataset is too small? I can train the model well with demo dataset and other larger dataset.