sh404SEF configuration problem

I have the new version of sh404SEF on a Joomla! 3.8.2 stable version with php 7.1.11. My problem: When I click on the configuration button, only the view darkens, but I can not see a page where I could make settings. When I click on the darkened page, it gets brighter again, but that's about it. What can I do? Where could my problem be?
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