Creating local index for viewing images online

I am trying to create a local index for using the images offline. However, I run into an error when I follow the steps supplied here

```
http://labelme.csail.mit.edu/Release3.0/br...ols/php/dataset.php
```

below "Option 2: Access the online database directly with the LabelMe Matlab toolbox". When I run the line that creates a local index,

```
D = LMdatabase(HOMEANNOTATIONS);
```

it gives me the following error:

```
Error using str2num (line 32)
Requires string or character array input.

Error in LMdatabase (line 239)
v.annotation.object(m).id =
str2num(v.annotation.object(m).id);
```

Could someone help me fix this?

Thank you!