I get an error when i login via Facebook credentials (error log attached) - i'm using localhost as my server.
Looks like it's taking much longer than usual for it to connect to Facebook.
You can try increasing the max execution time in PHP from 30 seconds to something higher since it's on your localhost. Find the php.ini config file in your XAMPP setup and set max_execution_time equal to something like 300 seconds.
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