Error page in admin after install (version 3.0.9)

Hello, I just installed this plugin on a clean site (magento 2.2.4) and in admin I get a “whoops, our bad” page:
 
Whoops, our bad…
The page you requested was not found, and we have a fine guess why.
If you typed the URL directly, please make sure the spelling is correct.
If you clicked on a link to get here, the link is outdated.
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Any ideas?