Frequently Asked Questions:
When I switched to the ProPhoto theme, I got a blank grey screen that said: “Fatal error: Call to undefined function: is_tag() …”
IF you have this problem, you almost certainly have an old version of WordPress. Due to the advanced features, specifically inline commenting, you need at least WordPress Version 2.3.2 or higher. It is always best to stay up-to-date with the most current version of WordPress.
So, you’ll need to upgrade WordPress. Instructions can be found here:
http://codex.wordpress.org/Upgrading_WordPress
the simple version is:
a) back up your mySQL database (not 100% necessary, but always a good idea)
b) back up your ‘uploads’ folder, located in ‘wp-content’ (again, not necessary, but a good idea) by downloading the whole folder to your computer so you have a copy in case you mess up step C.
b) download the newest version of Wordpress from http://wordpress.org/download
c) unzip the file and REMOVE the “wp-content” folder so that you DO NOT upload it.
d) upload the rest of the whole folder into the same directory where your blog exists. all the files should overwrite the old ones.
If you’re version of WordPress is really old, it may prompt you to upgrade your database once you’ve got the new version installed. (This is why I recommend backing up your database first. i’ve never had a problem in the upgrades I’ve done, but the thought of ‘upgrading my database’ without backing it up gives me the willies.)
Usually you can backup your database fairly simply from within your web host control panel. Look for your mySQL manager and there is probably a button to backup the database. If you’re stuck, call your web host and ask them to talk you through backing up a mySQL database. If you act dumb and happy, they should help you.
Questions? Instead of emailing for support, leave a comment below so everyone can benefit from any clarification.