I am working on Panel Data , N:25 T:15. ı need to perform CS-ARDL with xtdcce2 code. I run this code '' xtdcce2 dy1 dx1 dx2 dx3 dx4 dly1 dlx1 dlx2 dlx3 dlx4, cr( dly1 dlx1 dlx2 dlx3 dlx4) reportc lr( ly1 lx1 lx2 lx3 lx4) cr_lags(2)'' but the program give me error ;

Units (code) to be removed due to insufficient numbers of observations: 1 2 3 4 5 6 7 8 9 10 11 12
> 13 14 15 16 17 18 19 20 21 22 23 24 25

No observations left.
r(2001);

Whats wrong ?