[solved] Ender 3 V3 KE filament is current running out and printing has been suspended

Hello, I’m Paolo, this is my first post.
My new “ender 3 v3 ke” printer arrived yesterday. I assembled everything according to the instructions.
I loaded the included PLA filament, and It seems to be right. I started printing the example file on the USB stick, but the printer says “filament is current running out and printing has been suspended” and printer prompts me to reload the filament. I follow all the instructions, but it keeps showing the same error." What is wrong ? I cannot undestand. Thank in advance, Paolo

Check the connection to the runout sensor, both ends, it might have come loose.

Thank you. Solved!
very trivial… the filament did not pass through the middle of the sensor, going to directly to nozzle ! The printer was right… the filament wasn’t there! Assembled correctly, now it works!