Hi, the error you got from the ctrlX CORE, shows that you tried to install an app you build for base: core18 at a ctrlX CORE (V1.12 or newer) with core20 as its system app. So you have to build your app for base: core20 (e.g. snapcraft.yaml of a sample in the SDK). To do that you need a App Build Environment which is a Ubuntu 20.04 Linux operating system with a special set of software packages and certain settings. There are different ways to setup such a development environment. See this documentation on the different possibilities and how to setup one. Recommended is to setup the build in App Build Environment of ctrlX WORKS (V1.14). But you could also set up an App Build Environment manually using qemu (see this Video). WSL2 is not one of the possibilities, because it isn't an ideal environment for working with Snapcraft. See more here. Best regards, Nick
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