This is not a bug with any mod itself or the game, but with the installer. This is on Version 9.15.1.01 of the Installer downloaded from MediaFire at 9PM EST.
When selecting mods to install, the installer throws this error when selecting "Overcross" in the "Crosshairs" Section of the Non-XVM Mods Section. This mod may not exist in the version of the Installer.