In order to succeed with your build in 'Zapp', one of the main important things is to always update your plugins, to the latest version.
There are 2 ways for updating your plugins:
1. Go to 'Zapp', on the left from the 'build' button, click on the drop down arrow and then from the list, click on 'Plugins configurations'
When there are plugins which need to update, (otherwise the build for the app won't work), you will see an 'alert message' in red on top of plugins screen:
Also, mind that there are plugins which you need to update too, indicated in green :
To update to the last version, click on the number of the version, that appear under the name of the plugin:
then you will get a list of versions, which you need to choose the latest one and save.
***Mind that, in some cases, the last version might not be fully integrated and therefore the build might fail even with the last version for the plugin. in those cases, a developer who made the plugin will guide you which version best to choose.
Now, after updating the plugins, make a build. its a must, otherwise, you wont get them updated in the app.