Dynamic Structure Fieldnames using Genvarname() Invalid

The help for genvarname() specifically says "If you use genvarname to generate a field name for a structure, MATLAB does create a variable for the structure and field in the MATLAB workspace. See Example 3, below."

The following code results in the following error at the first instance of genvarname(): "??? Argument to dynamic structure reference must evaluate to a valid field name."

count = 0;
while(true)
    count = count + 1;

      datafolder{count} = uigetdir(cd,...
          'Select the folder containing first test event:');
      if(~datafolder{count})
          datafolder(count) = [];
          break;
      end

      testname{count} = inputdlg({'Name of this test event'},'Name Test Event');
      if(isempty(testname{count}))
          error('No name entered');
      end

end

for test = 1:length(testname)
    testevents.(genvarname(testname{test})) =...
        processDataFolder(datafolder{test});
    testevents.(genvarname(testname{test})) =...
        analyzeData(testevents.(testname{test}));
    plotData(...
        testevents.(genvarname(testname{test})),...
        testname{test});
    plotAverages(...
        testevents.(genvarname(testname{test})),...
        testname{test});
end

Very confused. 'Test120112' was used as the input.

Answer 1

[per isakson]

The variable, testname, is a cell array of cells. Your code assumes it to be a cell array of strings

K>> class( testname{1} )
ans =
cell

[Eric]

Thanks for your help!

Answer 2

[Eric]

For those interested, as the answer I accepted didn't explicity give the change, it was a one-line error (attributable to 9 straight hours buried in this project):

testname{count} = inputdlg({'Name of this test event'},'Name Test Event');

becomes

testname(count) = inputdlg({'Name of this test event'},'Name Test Event');

Forcing testname to become a cell array of strings, instead of a cell array of cells.

This is why I avoid cells like the plague and just use structs.