Error in qr.coef(rss.qr, D %*% ss[[i]] %*% D) in R

I am using rstatix package in R to perform MANOVA test. The following error appears:

Error in qr.coef(rss.qr, D %% ss[[i]] %% D) :
exakte Singularität in 'qr.coef'

Does anyone know how I could solve the problem?