Zen Sub-theme Error

The great thing about Drupal is that it comes with a variety of themes available to download. If, like me however, you want to carve out your own theme then there is an incredibly useful way of doing this: the Zen theme.

Zen is a perfect starting point for anyone who wants to give theming a go for Drupal sites. It is well documented and within a few easy steps you can be on your way to creating your own theme.

I am a great fan of the zen theme & creating subthemes using it too, in fact all my Drupal work uses the Zen Subtheme structure. When it came to recreating my site using Drupal 6 I downloaded Zen and got to work styling and editing my own theme and all was well.

That was until I took the site live: when taking the site live I turned the ‘Rebuild theme registry on every page.’ function off (recommended as to increase performance) and when editing pages was faced with the following error:

* warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'theme_filter_tips' was given in *path_to_my_site*/theme.inc on line 617. * warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'theme_filter_tips' was given in *path_to_my_site*/theme.inc on line 617.

Now, after searching around on google for a solution I came up with a couple of potential fixes: the first was to clear the site cache under admin»site configuration»performance. No Result and the error remained.

BANG.(That was when it hit me.)

I had named my Zen subtheme: ‘theme’. I am still not sure what was going through my mind when I did but hey thats another story.


To fix the problem I copied my entire theme into a new folder and named it something new i.e: ‘supertheme’ then had to go through the .info & template files and change the name to: supertheme and the instances of ‘theme’ to supertheme.

Hey presto.

The problem was no more.

So to sum up: don’t name your Zen Subtheme: theme.

At least I hope it is. If you do notice any issues with the site then do comment and let me know :)

Filed under:

Rewilding the planet with freelance animation and motion design

We've only got one planet, and right now it needs all the help it can get. Climate change and biodiversity loss are massive challenges that we need to tackle head on.

That's why, for every freelance animation project over £1000 a donation of 1% of the total budget will be made to the World Land Trust, on your behalf.

The money will go towards WLT's "buy an acre" programme; buying up and protecting vital habitats around the world, and helping fight against climate change.

Any motion design projects under £1000 will have a tree planted on your behalf.

Acres saved so far:

Thanks to my wonderful clients and the animations we've produced, enough money has been donated to save around:

17.5 Acres of vital habitats around the world.

Just think, your animated explainer video or logo animation could also be helping fight the climate crisis!

If you're interested in some freelance animation work and saving the planet, get in touch and let's chat!