You must add "Type = OBJECT" to your Upgrade:
Upgrade Upgrade_ChinaOverlordPropagandaTower
DisplayName = UPGRADE:OverlordPropagandaTower
Type = OBJECT
BuildTime = 15.0
BuildCost = 500
ButtonImage = SSOLSpeaker
ResearchSound = OverlordTankPropagandaTowerVoiceCreate
UnitSpecificSound = OverlordExpansion
End
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