A common issue that occurs when exporting Android apps from Kotobee Author has to do with the Java Development Kit. It is a requirement to have it on your system for exporting your ebooks as Android apps. Even though you have JDK installed this error message telling you that it is not detected on the system may occur.
This cause of this issue has to with the newer versions of Java's JDK. To avoid this issue so you can smoothly export Android apps through Kotobee Author you will have to download JDK 1.8 or commonly known as Java SE Development Kit 8. Download and install JDK 1.8 from the website. For a step by step guide check our article: Installing Java JDK. If you have the newer version installed already simply uninstall it and install the correct version.