Ordinal regression warning

Hi everyone :)

Im running a simple ordinal regression with an ordinal outcome variable (low, medium, high), and I have 12 predictor variables which are all binary (yes/no), with a sample size of ~400.
When I run the regression, I immediately get a warning that I have "XX cells (i.e. dependent variable levels by observed combinations of predictor variable values) with zero frequencies."
I know this is common if there are continuous variables, however I have none.

So my question is, is this a big problem? What should my next steps be?

Thank you!