I have install ThingworxH2trial 8.4 version .
I have made mashup that is taking realtime value in gauge widget and I have used things ,MQTT extension,subscription and changevalue event .
Values are stored in valuestream successfully
But suddenly,When we open thngworx ,Following error is apeared. After that when we make again new things Base thing template is listed empty though MQTT extension is listed in extensions list.
[message: Entity Not Found : [Teksun_mqttThing]]
Error in writing to Data Table for Feature : twx_composer, Product: TWX_PLATFORM Error : Unable to store license usage data in data table due to error:null
Check the Catalina logs, but it looks like you lost connection to your H2 database or it got corrupted.
If that isn't it, check visibility permissions if you are not logged in as Administrator into Thingworx
Please let us know if you have resolved your issue or if questions remain.
If the issue is resolved, please either mark the response from @PaiChung as the Accepted Solution or post the solution and mark that as the Accepted Solution for the benefit of others with the same issue.