LefSe Error: Error in svd(X, nu = 0L) : infinite or missing values in 'x'

Hello! I am new to LefSe and am attempting analysis of a small data set of 6 samples. There are two groups to compare (5 samples in one group, one in the other). Any help you can provide is greatly appreciated. Below is the error message I receive after step B.

/galaxy_venv/local/lib/python2.7/site-packages/rpy2/rinterface/init.py:185: RRuntimeWarning: Error in svd(X, nu = 0L) : infinite or missing values in ‘x’

warnings.warn(x, RRuntimeWarning)
Traceback (most recent call last):
File “/shed_tools/testtoolshed.g2.bx.psu.edu/repos/george-weingart/lefse/a6284ef17bf3/lefse/run_lefse.py”, line 89, in
if params[‘rank_tec’] == ‘lda’: lda_res,lda_res_th = test_lda_r(cls,feats,class_sl,params[‘n_boots’],params[‘f_boots’],params[‘lda_abs_th’],0.0000000001,params[‘nlogs’])
File “/export/shed_tools/testtoolshed.g2.bx.psu.edu/repos/george-weingart/lefse/a6284ef17bf3/lefse/lefse.py”, line 189, in test_lda_r
z = robjects.r(‘z ← suppressWarnings(lda(as.formula(’+f+‘),data=sub_d,tol=’+str(tol_min)+‘))’)
File “/galaxy_venv/local/lib/python2.7/site-packages/rpy2/robjects/init.py”, line 359, in call
res = self.eval(p)
File “/galaxy_venv/local/lib/python2.7/site-packages/rpy2/robjects/functions.py”, line 178, in call
return super(SignatureTranslatedFunction, self).call(*args, **kwargs)
File “/galaxy_venv/local/lib/python2.7/site-packages/rpy2/robjects/functions.py”, line 106, in call
res = super(Function, self).call(*new_args, **new_kwargs)
rpy2.rinterface.RRuntimeError: Error in svd(X, nu = 0L) : infinite or missing values in ‘x’

I was able to get this output: Number of significantly discriminative features: 17 ( 17 ) before internal wilcoxon.

Many thanks,

Nina