Error: number of observations (=44) <= number of random effects (=44) for term (1 + time | subject)

[AlexanderUm]

First of all thank you for a very useful package! It would be great if you can give some clarifications regarding the following error: Error in linda: Error in fun(i): task 1 failed - "number of observations (=44) <= number of random effects (=44) for term (1 + time | subject); the random-effects parameters and the residual variance (or scale parameter) are probably unidentifiable" This error occurs frequently when generate_taxa_test_pair() function is used, including dataset provided together with the MicrobiomeStat package(peerj32.obj). Despite the error, the function produce results, however I am not sure if this results are reliable. Can you please clarify this issue?