Could not load analysis engine. Error while loading engine: Unregistered class

dantcamui

Hi,
So I installed .vapkg file and it has the yellow warning as:

Could not load analysis engine. 
Error while loading engine: Unregistered class.

What does this warning mean? And how can I fix it?
And also I realized that the .vapkg file is made for VisionAppster version 3-beta4, but I used the version3-beta2 of my device, so does it affect anything (I am not the person who developed the vapkg files so I'm not really used to it)
Here is the output of

systemctl status va-engine

[[0;1;32m●[[0m va-engine.service - VisionAppster Engine
   Loaded: loaded (/etc/systemd/system/va-engine.service; enabled; vendor preset: enabled)
   Active: [[0;1;32mactive (running)[[0m since Wed 2020-04-15 06:22:58 UTC; 2h 55min ago
 Main PID: 290 (flatpak-bwrap)
   CGroup: /system.slice/va-engine.service
           ├─290 /usr/libexec/flatpak-bwrap --args 7 va-run /opt/visionappster/init/init.qml webServer=0.0.0.0:2015
           ├─310 /usr/libexec/flatpak-bwrap --args 7 va-run /opt/visionappster/init/init.qml webServer=0.0.0.0:2015
           └─315 va-run /opt/visionappster/init/init.qml webServer=0.0.0.0:2015

 flatpak[290]: GET /manager/properties/runningApps
 flatpak[290]: GET /apis/
 flatpak[290]: POST /manager/functions/startOnce
 flatpak[290]: qml: Error while loading engine: Unregistered class
 flatpak[290]: Could not load analysis engine.
 flatpak[290]: Error while loading engine: Unregistered class
 flatpak[290]: Could not load analysis engine.
 flatpak[290]: Error while loading engine: Unregistered class
 flatpak[290]: GET /manager/properties/runningApps
 flatpak[290]: GET /apis/

-mt-

@dantcamui This error generally means that the version of the engine that you have installed does not recognize some of the tools used in your app. Running it in the same (or newer) VisionAppster release as the one the app was created with should fix it.