Notice: Undefined index: version_major in update_calculate_project_update_status() (line 595 of ../update/update.compare.inc).

The same issue. Drupal Core 7.15.

Same issue here. Drupal 7.15. The error message went away after running update script once.
What I did before the error appeared was to rename the site's directory. Initially I gave it a temporary name while developing the site. Then I switched the official URL on to Drupal, which made it necessary to rename the site's directory according to the URL.

Same problem on 7.15 as well.

So do I. 7.15

Same issue. Brand new Drupal site.

same issue here

Having the same message for Drupal 7.15.

Same problem here. It has effected how some modules are working too. My Display Suite cannot update field displays, and changing the format filters has no effect, i.e. not accepting the changes, but only indication is this notice when updating.

Same error message - had since 7.14. Now running 7.16 and error message is still visible.

The same issue. Drupal Core 7.16.

Something is wrong. Please help.

Wusel

I have to change the version to 7.16.

Can I just check if anyone is using an automatically installation script provided by their hosting company? I haven't come across the problem previously until using one of these scripts.

Thanks a lot

Ian

I among using an automated script from my host. I used the Aquila dev installer, but with a core install.

Sorry, predictive text!! That should read, I am not using an automated script

Same error here since 7.14. Now on 7.16 and error remains. Not installed via automated script.

See #1343768: make update_calculate_project_update_status() work nicely with HEAD releases

Mine was a clean install from a full Drupal installation downloaded from Drupal.org -- no scripts.

replacing specific folder names in a path