why --prevalence flag doesn't work?

Hi all,

I'm running some analysis using a bivariate trait code as: 0, 1, NA
Here is an example of the command I'm using:

gcta64 --grm geneset2_GS14K_original --reml --pheno phenoGCTA_FID_IID_MDD --prevalence 0.122 --covar covarGCTA_FID_IID_Sex_Age --qcovar fullSetGS14K.eigenvec --out geneset2_GS14K_original --thread-num 20

However, --prevalence is not working, it is recognised by the software but doesn't provide V(G)/Vp_L. And I am interested on h2 ( V(G)/Vp ) on the underlying scale. The output I get looks like that: 

Source Variance SE
V(G) 0.000068 0.001785
V(e) 0.203593 0.003847
Vp 0.203661 0.003424
V(G)/Vp 0.000334 0.008765
logL 1942.415
logL0 1942.415
LRT 0.001
df 1
Pval 0.4847
n 7175

Do you know or have an idea why it doesn't work?

Tanks in advance,