advertisement module not work with Category module

The ad module only support the core taxonomy module, sorry. I've not used the category module myself, but it sounds like you might be able to get things working if you enable the "taxonomy wrapper" module that comes with the category module -- did you try this?

I gave this some more thought, and realized I make a few direct queries into the taxonomy tables. So no, it's not going to work without some code changes. If the category module ever ended up in core, then I'd support it with the ad module. But it's not likely to happen before that.

If someone can submit some patches that cleanly supports both taxonomy and category, I'd happily merge them.

Given that Advertisement module has a dependency on the Taxonomy module, is there anything that can be done on the module admin page to stop Taxonomy module being disabled when Advertisement module is active. Even displaying that there is a dependency would be useful.

I found out the hard way and my site died completely with a "call to undefined function taxonomy_get_tree() from ad.module line 1700".

Thanks

Yes, agreed, the ad.info file needs to be patched to specify that it requires the taxonomy module. I will do this.

Ad.info has been updated to reflect that the ad module depends on the core taxonomy module.