MethodCallRename with a namespaced class

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Here's my rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\Renaming\Rector\MethodCall\RenameMethodRector;
use Rector\Renaming\ValueObject\MethodCallRename;

return RectorConfig::configure()
    ->withConfiguredRule(RenameMethodRector::class, [
        new MethodCallRename('\SomeExampleNamespace\SomeExampleClass', 'oldMethod', 'newMethod'),
    ]);

Running that via vendor/bin/rector process src --dry-run --debug gives me this error:

[ERROR] "\SomeExampleNamespace\SomeExampleClass" is not a valid class name

Running that via https://getrector.com/demo/ gives me this error:

Expected config should return callable RectorConfig instance

Any ideas?

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Doing SomeExampleNamespace\SomeExampleClass instead of \SomeExampleNamespace\SomeExampleClass did the trick.