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"ServerID must be a string" problem

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I can not read the data from the dialogue box to connect the OPC server. The error occurs: "ServerID must be a string"
Here's the code:
function Newhost_Callback(hObject, eventdata, handles)
prompt = {'Host name:'};
dlg_title = 'Input';
num_lines = 1;
defaultans = {'Matrikon.OPC.Simulation.1'};
answer = inputdlg(prompt,dlg_title,num_lines,defaultans);
da = opcda('localhost', answer);

Accepted Answer

Walter Roberson
Walter Roberson on 30 Nov 2015
inputdlg() always returns a cell array, not a single string.
da = opcda('localhost', answer{1});

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