Attempt to reference field of non-structure array.

I get this error every time I try and run a GUI (1) from my main menu GUI (2). GUI (1) runs on it's own just fine. when I run GUI(1) from GUI(2) I get the error "Attempt to reference field of non-structure array" and says there is an error in the way i am calling to my values "T_FSin = str2double(get(handles.T_FS_in, 'string'));" under the Run button callback. NOW GUI(1) works when i run it byitself. GUI(2) is just a main menu GUI that opens GUI(1) and then closes after I choose a calculation method. I don't understand why my GUI(1) won't work after i run it though the GUI(2). I have a third GUI and it runs just fine after being called by GUI(2). Any ideas? I'll post code if needed. Thank you

CODE IS

sa = get(handles.edit1,'String');
sb = get(handles.edit2,'String');
sc = get(handles.edit3,'String');

error is

Attempt to reference field of non-structure array.

[Walter Roberson]

How are you "opening" GUI(1) from GUI(2) ?

[Jacob Capra]

The problem is the syntax of 'handles.edit1'

MatLab interprets that as a reference to a field 'edit1' in a structure 'handles'. I am having the same issue with my GUI and cannot find different syntax to use to store information from my GUI.