I don't think CMP is compatible with Reaver's Harmony... or with anything else for that matter.
Anyhow, the crash is on the STR_ALIEN_TERROR mission.
Mission from your save:
alienMissions:
- type: STR_ALIEN_TERROR
region: STR_ANTARCTICA
race: STR_SECTOID
nextWave: 2
nextUfoCounter: 0
spawnCountdown: 4290
liveUfos: 0
uniqueID: 1
missionSiteZone: 5
The game is trying to access the 6th area (missionSiteZone: 5) in the 4th mission zone (spawnZone: 3) of STR_ANTARCTICA region... but there are only two areas there... so it crashes.
Why it decided to access the 6th, I don't know... could be mod incompatibility or could be your save is corrupted (potentially by enabling mods mid-campaign).
Or could be something else, hard to say.