If you want to examine the log outside the environment of your phone, there is the application LogCollector. It's free and it allows you to send/upload the log.
Locate the log files in the AAPS data directory, in Android-data-info.nightscout.androidaps-files . The naming of the root storage folder may vary a little ...
They are stored as circular memory buffers on the device. If you run adb logcat > myfile on your host system, you can retrieve the content into a file.
Open your file manager and navigate to the Android device · Browse to <Android-device>-Internal storage-logback directory · Copy EveryonePrint.log to the ...