Where exactly does the error show up? That will help us know what software is causing it. The error is caused by a mal-formed custom option. There will probably be the error messaege where there should have been an option description.
BTW, you should use the defines for the custom option types. Much better programming practice and more likely to survive future Zenphoto updates.
And also you might want to include the following in the beginning of your script since it requires PHP 5 `$plugin_disable = (version_compare(PHP_VERSION, '5.0.0') != 1) ? gettext('PHP version 5 or greater is required.') : false;`
From the image, it would appear to be an issue with the Zenpaypal plugin. Disable that plugin and see if it goes away. I am not familiar with the Zenpaypal plugin, but from the error, it has an option that lacks the option description part.
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And also you might want to include the following in the beginning of your script since it requires PHP 5
`$plugin_disable = (version_compare(PHP_VERSION, '5.0.0') != 1) ? gettext('PHP version 5 or greater is required.') : false;`
I use a max option defined. And, ok, for the include to compare PHP5 ;-)
But, perso, i run on PHP 5 !