using Pharo 7 from Pharo Launcher gives warning about changes file

Just reinstalled pharo launcher new.

Select the Pharo 7 (development version) entry,

create an image and start it.

It always shows a warning about the changes :

"
Pharo cannot write to the changes file named C:\Users\nicolai\Documents\Pharo\images\Pharo 7.0 (development version)\Pharo 7.0 (development version).changes.

Please check that you have write permission for this file.

You won't be able to save this image correctly until you fix this."

But I can save the image, and reopening gives the same message.

I don't know if this is an Pharo 7 or a Pharo Launcher issue, but

starting a pharo 6.1 image does not give this message.

nicolai