Build #621 (Aug 12, 2019 10:03:05 PM)

	Build Artifacts
	Changes Improve error message of duplicated slots. (details / githubweb) The window of the world has to start centered. (details / githubweb)
	Push event to branch Pharo8.0 at 9:29:50 PM on Aug 12, 2019 Push event to branch Pharo8.0 at 9:32:30 PM on Aug 12, 2019
	Revision: f33092d2b0c3c658b0ed62b7f473367b6b0eb2ba Repository: https://github.com/pharo-project/pharo.git Pharo8.0
	Test Result (no failures)