The webpage is not displaying the default zenphoto page. The error message displays the following:

'Zenphoto found no theme scripts. Please check the themes folder of your installation.'

I noticed the /theme folder is not in the /zenphoto directory. I created a /theme folder in the /zenphoto directory and I uploaded zpgallerific_v1.4 and zpminimal in the /theme folder.

Well, first, if you got this message then you did not install the zenphoto package as distributed since that would have included at least some themes.

Second, if as you say, the `theme` folder is not in the /zenphoto folder then it is not properly placed so Zenphoto will naturally not find it.

Sounds like you should try again with the installation. This time pay attention to what setup tells you. It would have reported the missing standard themes which might have been a clue.

For those coming to this topic years later, when experiencing this problem with 1.4.5.1 installs, it turned out in our case to be simply a CHMOD setting. There were no relevant issues reported in the setup. We changed the permissions on the themes folder and all was well.