[SOLVED] Magento 2 Error: A technical problem with the server created an error. Try again to continue what you were doing. If the problem persists, try again later.

Sometimes debugging on Magento can be annoying, specially if something just arises out of the blue, not while you are actually writing a code.

Magento Error - Technical Problem with server
If Problem Persists, try again later

This is something that occurs on Magento admin panel. As of now, it can be one out of 3 reasons, let us discuss them:

1. Admin Password

Try to change admin password, log out and log in again. This should fix it.

2. Some un compiled code or pending schema change

upgrade, compile, deploy, reindex, clean cache

rm -rf generated/* var/cache/* var/view_preprocessed/*
php bin/magento setup:upgrade
php bin/magento setup:di:compile
php bin/magento setup:static-content:deploy -f
php bin/magento indexer:reindex
php bin/magento cache:clean

3. Check for some extra output in the php files


See Line 41
One of the developers left this in index.php and this was just messing with the api calls from admin panel because it was corrupting json output.

Magento 2 temporary fix for Alphabetical sorting of Configurable product options

Just re-write the file vendor/magento/module-configurable-product/Model/ConfigurableAttributeData.php

<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
namespace Magento\ConfigurableProduct\Model;
use Magento\Catalog\Model\Product;
use Magento\ConfigurableProduct\Model\Product\Type\Configurable\Attribute;
/**
* Class ConfigurableAttributeData
* @api
* @since 100.0.2
*/
class ConfigurableAttributeData
{
/**
* Get product attributes
*
* @param Product $product
* @param array $options
* @return array
*/
public function getAttributesData(Product $product, array $options = [])
{
$defaultValues = [];
$attributes = [];
foreach ($product->getTypeInstance()->getConfigurableAttributes($product) as $attribute) {
$attributeOptionsData = $this->getAttributeOptionsData($attribute, $options);
if ($attributeOptionsData) {
$productAttribute = $attribute->getProductAttribute();
$attributeId = $productAttribute->getId();
$attributes[$attributeId] = [
'id' => $attributeId,
'code' => $productAttribute->getAttributeCode(),
'label' => $productAttribute->getStoreLabel($product->getStoreId()),
'options' => $attributeOptionsData,
'position' => $attribute->getPosition(),
];
$defaultValues[$attributeId] = $this->getAttributeConfigValue($attributeId, $product);
}
}
return [
'attributes' => $attributes,
'defaultValues' => $defaultValues,
];
}
public function labelsort($a,$b){ return strcmp($a['label'], $b['label']);}
/**
* @param Attribute $attribute
* @param array $config
* @return array
*/
protected function getAttributeOptionsData($attribute, $config)
{
$attributeOptionsData = [];
foreach ($attribute->getOptions() as $attributeOption) {
$optionId = $attributeOption['value_index'];
$attributeOptionsData[] = [
'id' => $optionId,
'label' => $attributeOption['label'],
'products' => isset($config[$attribute->getAttributeId()][$optionId])
? $config[$attribute->getAttributeId()][$optionId]
: [],
];
}
if(count($attributeOptionsData) > 1){usort($attributeOptionsData,array($this,'labelsort'));}
return $attributeOptionsData;
}
/**
* @param int $attributeId
* @param Product $product
* @return mixed|null
*/
protected function getAttributeConfigValue($attributeId, $product)
{
return $product->hasPreconfiguredValues()
? $product->getPreconfiguredValues()->getData('super_attribute/' . $attributeId)
: null;
}
}