Wordpress ERROR: Exception caught in Error: Call to undefined function GuzzleHttp\Psr7\uri_for()

[the1bit]

Hi,

I have been using your tool for ages. And some weeks ago my backup job fails every time with the following error:
ERROR: Exception caught in Error: Call to undefined function GuzzleHttp\Psr7\uri_for()

Accordingly, I have no backup now. :-(

Steps to reproduce the behavior:

1. Click Run job now
2. Wait some minutes then you can see it fails
3. No backup

Expected behavior
Run without error and do backup

System (please complete the following information):

• OS: Azure Linux Webapp
• Wordpress version: 5.7.1
• BackWPUp Version: 3.8.0

Detailed error log:

[INFO] BackWPup 3.8.0; A project of Inpsyde GmbH
[INFO] WordPress 5.7.1
[INFO] Log Level: Normal
[INFO] BackWPup job: Weekly Backup
[INFO] Logfile is: backwpup_log_daf44a_2021-04-27_20-37-37.html
[INFO] Backup file is: 2021-04-27_20-37-37_6FZH2WCQ01.tar.gz
[27-Apr-2021 20:37:38] 1. Try to backup database …
[27-Apr-2021 20:37:39] Connected to database on myprod.mysql.database.azure.com
[27-Apr-2021 20:37:41] Added database dump "backup.sql.gz" with 1,75 MB to backup file list
[27-Apr-2021 20:37:41] Database backup done!
[27-Apr-2021 20:37:41] 1. Trying to make a list of folders to back up …
[27-Apr-2021 20:39:14] Added "wp-config.php" to backup file list
[27-Apr-2021 20:39:14] 3309 folders to backup.
[27-Apr-2021 20:39:14] 1. Trying to generate a file with installed plugin names …
[27-Apr-2021 20:39:15] Added plugin list file "pluginlist.2021-04-27.txt.gz" with 2,13 KB to backup file list.
[27-Apr-2021 20:39:15] 1. Trying to generate a manifest file …
[27-Apr-2021 20:39:15] Added manifest.json file with 5,36 KB to backup file list.
[27-Apr-2021 20:39:32] 1. Trying to create backup archive …
[27-Apr-2021 20:39:32] Compressing files as TarGz. Please be patient, this may take a moment.
[27-Apr-2021 20:45:38] Backup archive created.
[27-Apr-2021 20:45:38] Archive size is 87,03 MB.
[27-Apr-2021 20:45:38] 19577 Files with 264,92 MB in Archive.
[27-Apr-2021 20:45:38] 1. Trying to send backup file to S3 Service …
[27-Apr-2021 20:45:40] ERROR: Exception caught in Error: Call to undefined function GuzzleHttp\Psr7\uri_for()
[27-Apr-2021 20:45:54] 2. Trying to send backup file to S3 Service …
[27-Apr-2021 20:45:54] ERROR: Exception caught in Error: Call to undefined function GuzzleHttp\Psr7\uri_for()
[27-Apr-2021 20:46:06] 3. Trying to send backup file to S3 Service …
[27-Apr-2021 20:46:06] ERROR: Exception caught in Error: Call to undefined function GuzzleHttp\Psr7\uri_for()
[27-Apr-2021 20:46:08] ERROR: Step aborted: too many attempts!
[27-Apr-2021 20:46:08] 1. Try sending backup to a Microsoft Azure (Blob) …
[27-Apr-2021 20:46:09] ERROR: Exception caught in Error: Call to undefined function GuzzleHttp\choose_handler()
[27-Apr-2021 20:46:17] 2. Try sending backup to a Microsoft Azure (Blob) …
[27-Apr-2021 20:46:17] ERROR: Exception caught in Error: Call to undefined function GuzzleHttp\choose_handler()
[27-Apr-2021 20:46:21] 3. Try sending backup to a Microsoft Azure (Blob) …
[27-Apr-2021 20:46:21] ERROR: Exception caught in Error: Call to undefined function GuzzleHttp\choose_handler()
[27-Apr-2021 20:46:28] ERROR: Step aborted: too many attempts!
[27-Apr-2021 20:46:28] 1. Trying to check database …
[27-Apr-2021 20:46:30] Database check done!
[27-Apr-2021 20:46:30] ERROR: Job has ended with errors in 533 seconds. You must resolve the errors for correct execution.

[JonnyTech]

Important missing detail: what version of PHP is running on the Wordpress server?

[the1bit]

Hi,

You are right.

PHP version: 7.2

[JonnyTech]

You seem to be hitting issue #94, try downgrading any other instances of GuzzleHttp to v6.5.5.

[the1bit]

Could you please help me how I can do it? Thx

[JonnyTech]

Which wordpress plugins have you installed?

[the1bit]

There are several ones. Latest was the online invoice maker for Woocommerce.

[JonnyTech]

I cannot help you unless you list full names of all installed plug-ins.

[the1bit]

Plugin Name: Integration for Billingo & WooCommerce
Version: 2.5.0

[the1bit]

I checked the plugin related files. I cannot find GuzzleHttp but I found BuzzleHttp.

Additionally I found the choose_handler part in vendor/buzzlehttp/buzzle/src/functions.php:

function choose_handler()
{
    $handler = null;
    if (function_exists('curl_multi_exec') && function_exists('curl_exec')) {
        $handler = Proxy::wrapSync(new CurlMultiHandler(), new CurlHandler());
    } elseif (function_exists('curl_exec')) {
        $handler = new CurlHandler();
    } elseif (function_exists('curl_multi_exec')) {
        $handler = new CurlMultiHandler();
    }

    if (ini_get('allow_url_fopen')) {
        $handler = $handler
            ? Proxy::wrapStreaming($handler, new StreamHandler())
            : new StreamHandler();
    } elseif (!$handler) {
        throw new \RuntimeException('BuzzleHttp requires cURL, the '
            . 'allow_url_fopen ini setting, or a custom HTTP handler.');
    }

    return $handler;
}

and this in vendor/buzzlehttp/buzzle/src/HandlerStack.php

public static function create(callable $handler = null)
    {
        $stack = new self($handler ?: choose_handler());
        $stack->push(Middleware::httpErrors(), 'http_errors');
        $stack->push(Middleware::redirect(), 'allow_redirects');
        $stack->push(Middleware::cookies(), 'cookies');
        $stack->push(Middleware::prepareBody(), 'prepare_body');

        return $stack;
    } 

[JonnyTech]

Looking at the plug-in page: https://wordpress.org/plugins/integration-for-billingo-woocommerce/

This plugin has been closed as of August 14, 2018 and is not available for download. This closure is permanent. Reason: Author Request.

The last commit was 4 years ago. I suggest finding a newer alternative plug-in.

But that may not be your issue since BuzzleHttp is not referenced in your error logs.

Do you have any other plug-ins installed?

[JonnyTech]

Ah, I found the correct link for your plug-in - could this be the issue: https://wordpress.org/support/topic/2-0-2-a-guzzlehttp-verzioja-breaking-change-et-tartalmaz/

[the1bit]

Hi,

I have found the latest version of this plugin. https://plugins.trac.wordpress.org/browser/billingo/tags/2.5.0?order=name

I upgraded for it, but it uses the same method so the backup still fail.

[richardpackham]

I am having the same error. have you found a solution for this yet?