I am trying to run a meta-analysis un TBSS FA data and want to run a linear model with 3 categorial parameters. Unfortunately, I get an error that I do not understand and that has not been discussed in the forum. I would greatly appreciate support in this!

# Run a Linear model using 50 imputations with variables diagnosis_group,age_group,SoC_group,'' and model [0,1,0,0,0] using filter '' as LM1 using 1 threads

LM1=mi_lm diagnosis_group+age_group+SoC_group,0+1+0+0+0,50,,1

Launched: sdm LM1=mi_lm diagnosis_group+age_group+SoC_group,0+1+0+0+0,50,,1
gsl: ../../gsl-2.6/linalg/lu.c:449: ERROR: matrix is singular Default GSL error handler invoked.