While I was cleaning up the non-used stuff from the game I must have accidentaly deleted stuff that is currently in use! Woops. Thanks Marcus for bringing this to my attention

I have already updated the download links with the missing texture.

OR if you don't want to redownload the whole game again, you can crab the file from the 0.15 folder (Paccsu 0.15/www/img/battlebacks1/SF_Concrete) and plate it in the 0.16 folder. 

OR you can download the picture below and place it in Paccsu 0.16/www/img/battlebacks1

(RENAME IT TO SF_Concrete.png)

Sorry for the inconvenience!