Error during uninstall

The function is defined at line 90 of xmlsitemap_helper.module.

Yeah, I think I got this the other day, too.

The issue is that if you uninstall the module as you do other modules (check off everything and click "Uninstall"), due to alphabetical sorting, xmlsitemap_helper.module comes before modules like xmlsitemap_node and xmlsitemap_user. Therefore, the module's already uninstalled at the point that these modules are running their hook_uninstall()s.

I believe there's a way to invoke a function call even in disabled modules or, failing that, the correct .inc file or whatever could just be included from the uninstall hooks for extra insurance.

Oh, hrm. Except it was in xmlsitemap.module?

Oh, I see. The xmlsitemap_helper module obviously has to be disabled in order to uninstall xmlsitemap, and therefore none of the function calls to it in uninstall hooks will work.

The xmlsitemap_helper_link_count() function should only be called from the functions that generate the site map content; the error message can be ignored while uninstalling the project modules.

I can add some code lines to verify the module is enabled. Would the code help in someway?

I checked the code as it is after my last commits, and I don't find any call to functions declared in xmlsitemap_helper.module. The function reported in the error message you wrote is only called from the menu callback for sitemap.xml (or from a function called from that menu callback).

I am changing the status, as the uninstall code doesn't call any functions defined in another module.
If I am missing something, please re-open the issue.

Is there anyway to resolves this issue at the moment? Or is this uninstallation issue a 'harmless' bug that I can safely ignore?

I think your assumption is correct; if the module is the last to be uninstalled, the functions it declares will be still be available when the other modules are uninstalled.

I added the code to change the module weight to 15. I hope this helps.

- Duplicated comment -

This certainly helped. Thank you!

I think the issue can be considerate fixed.