The type LeKoala\DebugBar\Test\Ex...pe\ORM\Connect\Database was not found. Did you mean SilverStripe\ORM\Connect\Database? If so, make sure to prefix the type with \.
It seems like SilverStripe\ORM\DB::get_conn() of type SilverStripe\ORM\Connect\Database is incompatible with the declared type LeKoala\DebugBar\Test\Ex...pe\ORM\Connect\Database of property $conn.
Our type inference engine has found an assignment to a property that is incompatible
with the declared type of that property.
Either this assignment is in error or the assigned type should be added
to the documentation/type hint for that property..