Odd error when using plugins

I use Jean-Paul Devulder OSX plugins in several apps.
When using the plugins the Console output always gives this error:

19/02/16 09:57:22,628 AppTest[285]: objc[285]: Class QTMovie is implemented in both /System/Library/Frameworks/QTKit.framework/Versions/A/QTKit and /Applications/AppTest.app/Contents/Frameworks/libdtplugins64bits.dylib. One of the two will be used. Which one is undefined.

Jean-Paul told me this is a Xojo bug and Joe is informed about this.

Can someone explain why this happens? Can this be fixed?

BTW the app doesn’t us anything related to QTKit.

They removed QuickTime support from 2014r1

This is not a Xojo bug. The ‘libdtplugins64bits.dylib’ plugin has an Objective-C class with the same name as one in a system framework, which is a very bad thing.

These are similar but basically harmless because the two dylibs are literally byte for byte identical and controlled by Xojo.

I have the same issue. However I am unable to open a project I have been working on for months. (Yes I have backups)
The above error messages appear in my console but point to the 2016 Rel 2 folder.