error: Please enter a valid function

[sandeepnmenon]

Getting the following error while running the command as mentioned in the Readme

ccvLabeler('../cordova1/','labels.ccvl')
error: Please enter a valid function
error: called from
ccvLabel at line 21 column 37
ccvLabeler at line 48 column 11

It is failing as per mentioned above in the lines

%default for adding label
gAddLabel = ccvLabel('', [], gLabelTypes{gLabelAddType}, ...
            gLabelSubtypes{gLabelAddType}{1}, []);
in ccvLabeler 

%check if we have a valid input function
if isempty(f) || ~exist(f, 'file'), error('Please enter a valid function'); end;
in ccvLabel

Am I missing something?