Hi, you need to boot it into the mode where you can wipe the cache and restart, the error should disappear. Shut down the device. Hold the Volume Up key along with Bixby key and while holding the two also press and hold the Power key. When the Samsung logo displays after NOTE 9 display, release all three keys. Android system recovery menu options will appear and one of the options will be called wipe cache, you can press the Volume down key several times to highlight wipe cache partition . Press Power key to select. Press the Volume down key to highlight yes , press the Power key to select. When the wipe cache partition is complete, Reboot system now is highlighted. Press the Power key to restart the device. and Viola, this should help!
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