Warning! Convergence not achieved xtdpdml

[Lisa Jesseee]

Hi everyone,
I am working with a panel data set, 4 waves, long forma, that looks like this:

* Example generated by -dataex-. For more info, type help dataex
clear
input long fallnum byte alter float srh byte anzkind float(spouse sum_helpfromchildren) byte female float iscedx

1000024 68 3 3 0  0 1 2
1000024 71 4 3 0  0 1 2
1000024 74 4 3 0  1 1 2
1000024 77 4 3 0  0 1 2
1000219 84 2 2 0  1 1 3
1000219 87 3 1 0  1 1 3
1000219 90 3 2 0  1 1 3
1000219 93 3 2 0  1 1 3
1000338 84 3 2 0  0 1 2
1000338 87 3 2 0  0 1 2
1000338 90 3 2 0  0 1 2
1000338 93 3 1 0  0 1 2
1000571 67 4 1 1  1 1 2
1000571 70 4 1 1  0 1 2
1000571 73 3 1 1  0 1 2
1000571 76 4 1 1  0 1 2
1000596 77 3 2 0  0 1 3
1000596 80 4 2 0  1 1 3
1000596 83 3 2 0 .a 1 3
1000596 86 2 2 0  1 1 3
1000702 79 4 5 1  0 0 3
1000702 82 4 5 1  0 0 3
1000702 85 4 5 1  0 0 3
1000702 88 4 4 1  1 0 3
1000740 74 4 2 0  0 1 1
1000740 77 2 2 0  0 1 1
1000740 80 4 2 0  0 1 1
1000740 83 4 2 0  0 1 1
1000860 76 3 2 1  0 0 2
1000860 79 3 2 1  0 0 2
1000860 82 4 2 1  0 0 2
1000860 85 3 2 1  0 0 2
1000862 75 4 2 1  0 1 1
1000862 78 4 2 1  0 1 1
1000862 81 4 2 1  0 1 1
1000862 84 2 2 0  0 1 1
1000863 66 3 2 1  0 1 2
1000863 69 4 2 0  0 1 2
1000863 72 3 2 0  0 1 2
1000863 75 3 2 0  0 1 2
1000873 79 3 3 0  0 1 1
1000873 82 4 3 0  0 1 1
1000873 85 3 3 0  1 1 1
1000873 88 3 3 0  0 1 1
1000874 77 2 3 1  0 0 2
1000874 80 2 3 1  0 0 2
1000874 83 3 3 1  0 0 2
1000874 86 2 3 1  1 0 2
1000881 76 4 4 1  0 0 3
1000881 79 4 4 1  0 0 3
1000881 82 3 4 1  0 0 3
1000881 85 4 4 1  0 0 3
1000928 84 2 1 1  0 0 3
1000928 87 2 1 1  0 0 3
1000928 90 3 1 1  0 0 3
1000928 93 1 1 1  0 0 3
1001030 74 5 2 0  0 1 1
1001030 77 5 2 0  0 1 1
1001030 80 5 2 0  0 1 1
1001030 83 5 2 0  0 1 1
1001031 73 5 2 1  0 1 2
1001031 76 5 2 1  0 1 2
1001031 79 3 2 1  0 1 2
1001031 85 3 2 1  0 1 2
1001101 82 3 2 0  0 1 1
1001101 85 2 2 0  1 1 1
1001101 88 3 2 0  0 1 1
1001101 91 3 2 0  0 1 1
1001131 76 3 2 1  0 0 1
1001131 79 3 2 1  0 0 1
1001131 82 4 2 1  0 0 1
1001131 85 4 2 1  0 0 1
1001173 73 4 1 1  0 0 2
1001173 76 4 1 1  0 0 2
1001173 79 4 1 1  0 0 2
1001173 82 4 1 1  0 0 2
1001216 68 3 3 1  0 1 2
1001216 71 3 3 1  0 1 2
1001216 74 3 3 1  0 1 2
1001216 77 3 3 1  0 1 2
1001273 70 3 1 1  0 0 3
1001273 73 3 1 1  0 0 3
1001273 76 4 1 1  0 0 3
1001273 79 3 1 1  0 0 3
1001303 75 3 2 1  0 0 2
1001303 78 3 2 1  0 0 2
1001303 81 3 2 1  0 0 2
1001303 84 3 2 1  0 0 2
1001306 73 4 2 1  0 0 3
1001306 76 3 2 1  0 0 3
1001306 79 4 2 1  0 0 3
1001306 82 4 2 0  0 0 3
1001416 71 3 4 1  0 0 3
1001416 74 3 2 1  0 0 3
1001416 77 3 4 1  1 0 3
1001416 80 3 4 1  0 0 3
1001436 78 3 2 1  0 0 2
1001436 81 4 3 1  0 0 2
1001436 84 3 4 1  0 0 2
1001436 87 4 4 1  0 0 2
end
label values fallnum misslab
label values alter ALTER_17
label values anzkind ANZKIND

I am using the command "xtdpdml" for a cross-lagged panel model with fixed-effects. The syntax is as follows:

    xtdpdml     sum_helpfromchildren alter anzkind spouse, pre(srh L.srh) inv(female iscedx) errorinv decimals(3) title(ML-SEM of instrumental help on self-rated health) gof

For some robustness checks, I want to estimate the effect with a fully balanced panel. However, for some reason (and not with all commands) i get the following warning:

" Warning! Convergence not achieved "

Then, the output provides me with the coefficients, however, not with the other indicators.

Can someone help me with it?
Best,
Lisa