Hi Grimmy, try moving the Mobile Advert object in the same folder as the Mobile Info object, or vice-versa.
There is a bug that we've recently discussed in the Discord server where the Mobile Advert locks a dependency id cordova-plugin-device
when it gets built first. It is an official Cordova plugin but for some reason the Mobile Advert prevents any object to use the plugin if it gets read first. For example, being in a higher folder.
Hence, adding it in the same folder allows you to build successfully.
I'm planning to report this in Construct 3's bug tracker as soon there are fewer filed bug reports there.