XenForo Upgrading to R5 from R4

[Aluminum Pints]

... stops with the following error:

RuntimeException: Unable to write to stream in src/vendor/guzzlehttp/psr7/src/Stream.php at line 260

Code:

GuzzleHttp\Psr7\Stream->write() in src/vendor/guzzlehttp/psr7/src/StreamDecoratorTrait.php at line 144
GuzzleHttp\Psr7\LazyOpenStream->write() in src/vendor/guzzlehttp/guzzle/src/Handler/CurlFactory.php at line 414
GuzzleHttp\Handler\CurlFactory::GuzzleHttp\Handler\{closure}()
curl_exec() in...

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