[Miguel Garcia] Hi, I'm New with Zope, and I need to make a external method to open a file, search some things and return those values, I have the script already make in Python. When I run in Python it runs fine, but when I put it on the extension folder of Zope and added the external method in the Zope folder where I need to start the search, this returrn an error that say " Zope Error Zope has encountered an error while publishing this resource. Error Type: IOError Error Value: [Errno 2] No such file or directory: 'chr1/CDS.htm'" The external method is in a folder called database, inside that folder are 14 folders called chr1, chr2, chr3 etc..., and inside any folder is a DTML document called CDS.htm. Please help me with this because I don't know what's the problem. [Tom P] The external method uses whatever default path is in effect when it is called. Of course, it is not likely to be the path that you want. You should not try to control that. Instead, you should make sure that your data files are in a location known to the external method. BTW, the external method would best be in the Extensions folder rather than some subfolder. There are several ways to get a known path. Here are some of them - 1) Hard code the path into the code. This is the least desirable approach, because the code will break if you move the installation of the data. But it may serve for testing purposes. 2) Put the path to the data into an environmental variable and read it when your external method starts. This is better than 1), but not that much, since somewhere you have remember to set that environmental variable. 3) Put all your external method code into a folder somewhere outside of the Zope installation, put it onto the Python path, and make it a Python package. Change your external method so that it is just a stub that calls the real code. The code in the package can find out its own location (using the __file__ attribute). Put the data folders in a known location relative to the package (maybe in subfolders), and use os.path methods to construct the paths to the data files based on the __file__ location. I highly recommend 3). With this approach, the code automatically finds its data no matter where the installation or code is moved to. You do not have to remember to do anything to make this happen, it just works automatically. As a byproduct, the Extensions folder remains simple and uncluttered, which is a good thing, especially when you want to update Zope. The thing NOT to do is to change the current path, because you have no idea what other bits of code may rely on the value of that path. They should not, but you best not rely on that "should". Cheers, Tom P