I'm guessing you are using Cocoon.IO to build.
This is a Cocoon.IO issue. Although there is a workaround by:
- Set the Target API to any number from the drop-down.
- On the config.xml. Replace the Target API value to 26.
- Then, you are ready to go.
Although, that is only a workaround. Cocoon.IO is still very outdated, that is merely a trick into making your .APK look like the latest. I recommend using Phonegap, C3 Build Service or Cordova CLI to build using the latest API for a more efficient .APK with a significantly lighter size.
Config.XML , the one to change:
Reference :: forums.cocoon.io/t/api-level-26-obligatory-from-august/7563
Look at the forum post, for more info.