global Y FE1
global X v1 v2 v3 v4 v5 v6 v7 v8 v9 v10 v11
global D DID
ddml init partial, kfolds(5)
ddml E[Y|X]: pystacked $Y $X, type(reghdfe) method(lassocv)
ddml E[D|X]: pystacked $D $X, type(reghdfe) method(lassocv)

ddml crossfit
Cross-fitting E[yX]        equation: FE1
Cross-fitting fold 1        too few variables        specified
r(102);

end of do-file

r(102);
求助，这个怎么解决