Check Device Version
Settings >> About >> Version
Solution 1. If the APP version is lower than V1.07_2.14, tap "Clear up" first, then upgrade the software.
Solution 2. If the problem has still not been solved after cleaning up the cache, please copy these 2 APK to a SD card.
Remove the cover of Creader CRP919E device, here is the SD card port. Insert the SD card.
Settings >> Long press "Network" and slide up repeat 3 times.
Settings>> Input 668, confirm
Storage >> Install 2 APK
After installation is completed, re-connect to WiFi.
Now the problem was solved! The error reminder has gone.