"Problem appending pixel buffer at time" with the SimpleVideoRecorder example #317

I run the source code of "SimpleVideoRecorder" example on my iphone 6 plus (iOS12.4.7), and keep meeting the following message.
Problem appending pixel buffer at time: CMTime(value: 137283152916500, timescale: 1000000000, flags: __C.CMTimeFlags(rawValue: 1), epoch: 0) --> MovieOutput.swift: newFramebufferAvailable(_:fromSourceIndex:): 167

I also checked the Info.plist, which is the same. I use the latest Xcode 11 (Version 11.5 (11E608c)).

Any suggestion? Thanks in advance!