Chartboost show ads problem NO_HOST_ACTIVITY

[houfaru]

Godot version: 3.0.2
Chartboost version:7.1.0

Hello,
I'm trying to use your chartboost module, but I'm getting NO_HOST_ACTIVITY error when i try to call show_rewarded_video or show_interstitial_ad.
Do you have any idea why? Which Chartboost sdk version did you use to test it?

I did the following steps:

1. add your module to ${GODOT_ROOT}/modules
2. put the chartboost sdk into ${GODOT_ROOT}/modules/GodotAds/libs/
3. add modules="org/godotengine/godot/GDChartboost" into project.godot
4. initialize:
   var Chartboost = Globals.get_singleton("GDChartboost")
   var _dict = Dictionary()
   _dict["app_id"] = "Your chartboost app id"
   _dict["app_signature"] = "your chartboost signature"
   Chartboost.init(_dict, get_instance_id())
5. call Chartboost.show_rewarded_video() or Chartboost.show_interstitial_ad()

• both types of ads were successfully cached

thank you