Octave does not recognize an outgroup

[Beginner1]

Octave gives me problems in my code in these segments:

inname_group_tot={'id_AC','iq_AC','id_gen_sync','iq_gen_sync'};
outname_group_tot={'id_load','iq_load'};
sys_full=connect(sys,  sys_gen_sync_tot,inname_group_tot,outname_group_tot);

The message error is below:
error: lti: outgroup or outname 'id_load' not found
error: called from
    __str2idx__ at line 36 column 9
    __lti_prune__>@<anonymous> at line 37 column 25
    __lti_prune__ at line 37 column 9
    __sys_prune__ at line 29 column 30
    connect at line 189 column 9

It does not make sense, since the names enclosed in the outgroup
{'id_load','iq_load'} do not need to be looked for.  These are the final
responses of the system. I would understand the message if these were
intermediate responses in between other responses. {'id_load','iq_load'} are
just their names to plot them against time. 

I have worked with connect command before by connecting several systems as I
do here and no issue happened. 

Many thanks




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