15+ Most Common Magento 2 Errors You Can Avoid

Working on the Magento store is not that easy either for developers or admins whatever task they're engaged in. And though Magento 2 errors are something one never wants to meet, you may encounter them when installing Magento 2 extensions, updating Magento, creating multiple product-related requests, running some script or file with no execute permissions, etc.

These errors in Magento might range from harmless to quite complex influencing your website performance and customer experience. However, in most cases, they're relatively easy to handle if you detect why they appear timely. 

So this article is a breakdown of the most common Magento errors you can run into. Knowing the causes and types of the errors helps you avoid them in the future. 

Magento error 1: Access Denied

Magento Access Denied HTTP error 403 most commonly appears in the Magento admin panel. It occurs when you try to access a page you don't have permission to enter because of the wrong credentials or user role.

Fix Access Denied Error

Magento error 2: bash permission denied

Another common issue in Magento is "bash: bin/magento: Permission denied" which every developer comes across when running some script or file that doesn't have execute permissions. Fixing it takes about 2 steps. 

Fix "bash: bin/magento: Permission denied" Error

Magento error 3: Internal Server Error 500

Magento internal server error is the general 500 HTTP status code error that appears when the server can't return the requested page. While it might help just to reload the page, in most cases you will have to access the server logs to find more information on the issue.

Fix "Internal Server Error 500" Error

Magento error 4: 503 Service Temporarily Unavailable

Error 503 Service Temporarily Unavailable is the other common issue in Magento 2 that might happen when you try to access Magento admin or storefront after installing Magento 2 extensions or Magento. This text usually follows it:

"The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later" or "The server is temporarily unable to handle the request". It means that the server can't handle your request instantly or it might be misconfigured.

Fix "503 Service Temporarily Unavailable" Error

Magento error 5: No such entity

If you try to load a non-existing object in Magento 2 Repository Class you will most likely run into the "No such entity", "No such entity with", or "No such entity with customerId" issues.

It is usually caused by third-party Magento extensions. However, to have a broader picture you'll have to debug the vendor/magento/framework/Exception/NoSuchEntityException.php file.

Fix "No such entity" Error

Magento error 6: Invalid Form Key. Please refresh the page

Magento Invalid Form Key issues probably appear the most often in Magento admin and storefront and can have multiple reasons.

It appears when you update Magento, install new extensions, create configurable products, add a multitude of related products, and others. In general, this Magento error happens when you want to pass a big amount of data to the server when submitting a form. 

Because of the number of reasons for the "Invalid Form Issue" to appear, there could be multiple solutions correspondingly.

Fix "Magento Invalid Form Key" Error

Magento error 7: There has been an error processing your request

"There has been an error processing your request" is one of the most common Magento errors one faces when working with Magento. It could appear when you install or update Magento, Magento extensions, work with the settings, change template files, etc.

Once the system throws this error the exception printing is disabled for security reasons.  

In fact, the error message doesn't tell you much about what triggered the issue or what it is connected with. But the error log number does. 

Fix "There has been an error processing your request" Error

Magento Error 8: The following modules are outdated

Another error a Magento 2 developer can stumble upon is:

The following modules are outdated: Vendor_Module schema: current version - x.x.x, required version - z.z.z 

It can commonly happen in the dev environment when you switch git branches. Yet, updating Magento 2 or Magento extension can also be a possible scenario for this error to appear. But fortunately, it can be fixed in just a few steps.

Fix "The following modules are outdated" Error

Magento Error 9: Element 'block', attribute 'class' is not accepted by the pattern

You may encounter this error in Magento 2.2.x and higher versions. It is usually caused by outdated Magento 2 themes or extensions. Yet, it can be fixed easily if you know what files to check and what modifications to apply.

Fix "Element 'block', attribute 'class' is not accepted by the pattern" Error

Magento Error 10: Module 'Company_Module' from 'app/code/Company/Module' has been already defined in 'vendor/company/module'

The message of this error already explains the nature of the inconsistencies. It may happen after installing or updating Magento 2 extension.

The error basically means that you have a certain extension in two folders, namely app/code/Company/Module and vendor/company/module. Though the solution is not complicated, don't forget to create a backup before fixing the issue.

Fix "Module 'Company_Name' from..." Error

Magento Error 11: bin/magento Fatal error: Allowed memory size of xxx bytes exhausted

You may encounter this error when running the command "bin/magento...". It is caused by the PHP memory limit configuration. Yet, it can be solved using just one command with the specific parameter that allows to run PHP without memory limits. 

Fix "bin/magento Fatal error..." Error

Magento Error 12: Warning: file_get_contents(): SSL operation failed with code 1.

When trying to create a new customer account, reset a customer password or access your admin panel, you can get the following error:

Warning: file_get_contents(): SSL operation failed with code 1. OpenSSL Error messages:

There is a quick fix you can apply in this case. But it has its own specifics you should consider beforehand.

Fix "Warning: file_get_contents():..." Error

Magento Error 13: An element with a 'root' ID already exists

The error "An element with a 'root' ID already exists" can be caused by the third-party extension. It may be possibly calling methods to re-render a page. 

Thus, you need to investigate this error and find what extension causes it in the first place. After that, you'll have a clearer picture of what has to be done next. Contacting the vendor of the said extension can also shed some light on the further steps you need to take.

Fix "An element with a 'root' ID already exists" Error

Magento Error 14: Package exists in composer repo 1 and composer repo 2 which has a higher repository priority

You are most likely to receive this error when installing new extension packages via composer. It is related to the fact the module you're installing is in two repositories: the old version is in the Magento composer repository and the new one is in the free public repository. Thus since the Magento repository is of higher priority, you can't proceed with the installation but get the error. 

Fix "Package exists in composer repo..." Error

Magento Error 15: One or more indexers are invalid

The error "One or more indexers are invalid" is one of the most common Magento errors you can face in the admin panel. Though quite harmless at first glance, it shouldn't be ignored. 

One of the many tasks Magento 2 cron tasks are responsible for is running reindex. In most cases, it's run automatically. However, you'll get this error when there is something wrong with the crons.

Luckily, you can fix the issue right from the admin panel or via CLI.

Fix "One or more indexers are invalid" Error

Magento Error 16: An error has happened during application run.

One of the most common Magento 2 errors is "An error has happened during application run. See exception logs for details." The error can happen in various instances — when installing or upgrading Magento, or when the server connection is not accurate, or the compilation of Magento doesn't go smoothly. 

But the error message itself doesn't point out what exactly went wrong. So you need to explore exception log files in the var/log folder for more precise details. 

Fix "An error has happened during application run..." Error

Magento Error 17: data-vocabulary.org schema deprecated

The "data-vocabulary.org schema deprecated" error is what you may find when validating your website's pages. It has to do with the breadcrumbs structured data. To be more precise the error is caused by the fact that Google doesn't support data-vocabulary.org schema for the structured data anymore. It's been using schema.org since April 6, 2020.

Thus, if you haven't updated the breadcrumbs templates on your website yet, you're most likely to receive an error of such kind. So you should waste no time and fix it to allow search engines to analyze your website data better.

Fix "data-vocabulary.org schema deprecated" Error

Magento is a complex system with plenty of in-built features you can extend or edit using different third-party tools. Correspondingly, managing Magento requires you to troubleshoot it regularly to find and eliminate possible issues.

Now that you know about the reasons for the most common Magento issues you'll be able to fix them timely and ensure the faster performance of your store. 

If there are any Magento errors that we've missed, let us know in the comments down below.