When setting up the launch pad and pressing the 'Launch' button, the missile launch sound plays, the button locks saying there's no missile, but the missile never goes anywhere and just disappears after about a minute of inactivity.
The only thing that visually happens is the missile is rotated slightly for a frame or two when first launching, otherwise nothing.
There's nothing in the log to indicate any problems.

If you could provide a picture or video of the setup that would be useful. Also check server/client logs if any error happened.

Here are some images:



I've just got the launch tubes, launch pad, and screen. I turned off the power requirement so I don't need any other mods installed, but it's the same.
Stuff's real wacky, for some reason it's also saying there's no missile despite it being right there? It may be due to saving and loading while a missile is in the tube?

Ah I see the problem, those are not launch tubes... good idea though as they look like they fit XD. Will leave this open as its showing the wrong error message. Should say something like Unsafe to spawn missile

Anyways see https://github.com/BuiltBrokenModding/ICBM-Classic/wiki/How-to-play for how to setup the launchers. The part you think is a tube is meant to be a simi-functional decorative frame. You place them next to the launcher to make it look nicer and act as a place to connect the screen if desired.

Ha! I removed the frame blocks and the missiles instantly took flight.
Very confusing, given the name, the fact that they fit perfectly, and that missiles fit inside them perfectly, on top of there being no error or anything.
Maybe add a description to the block which says something like 'Decorative', or rename it along the lines of 'Missile Support Truss'?
Something to indicate that it doesn't have a functional purpose and isn't meant to be on top of the tube.