Error in MrVI differential abundance

Hi,

In the function ''differential_abundance, there is one line which generates error because n_cov_values is an integer:
f"It has {len(n_cov_values)} unique values, which exceeds one half of the total samples ({n_samples})."
TypeError: object of type ‘int’ has no len()

Thanks,
Yun-Ching

Thanks for raising this, we will make this fix asap!