This can mean one of two things:
1. You've set your mil placement module to not spawn any groups (or not enough groups) so TACOM can't take the objective (it needs at least 4 or 5 to hold an HQ location for Logistics purposes) or...
2. You are using a modded faction that does not have any groups properly defined and ALiVE can't detect any groups to spawn. Try using vanilla units to test if this is the case. We have a list of mods that support ALiVE on our wiki but they do change from time to time which can break things.
Combat Support is standalone and will work quite happily without any of the rest of ALiVE running - you can simply place the ALiVE (Required) module, Combat Support and then sync up the various support types to it.
Military Logistics needs a bit more setting up to work as it simulates a full logistics chain and needs at least one friendly objective, hence Mil Placement with some Groups, a Mil Comd to tell them what to do, the Log module itself, then the Player Combat Logistics module which gives you (the player) access to the logistics chain.