Problems with the evaluation form / problemas con los formularios de evaluación

Description of issue or problem I’m having:
Evaluation forms do not load when editors try to review submissions. What is the cause of this problem and how can it be solved? Thanks in advance.

Los formularios de evaluación no se cargan cuando los editores intentan revisar los envíos. ¿A qué se debe este problema y cómo poder resolverlo? Gracias de antemano.

Steps I took leading up to the issue:

What I tried to resolve the issue:

Application Version - e.g., OJS 3.1.2:
I am using OJS version 3.2.1.4.

Additional information, such as screenshots and error log messages if applicable:

How many languages does the journal have?
Can you edit the “Review Forms” in the administration panel?

Thanks for answering.
The magazine works in Spanish language and the forms are written in Spanish. However, the problem seems more serious than just the forms as several system questions are not loaded either. For example, categories, installed modules, editorial library.
We use the Chrome console to review and we find the following message:

jquery.min.js?v=3.2.1.4:2 [Deprecation] Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user’s experience. For more help, check https://xhr.spec.whatwg.org/.
send @ jquery.min.js?v=3.2.1.4:2
/index.php/REVIEM/$$$call$$$/grid/files/review/editor-review-files-grid/fetch-grid?submissionId=27&stageId=3&reviewRoundId=15&=1634951969468:1 Failed to load resource: the server responded with a status of 503 ()
/index.php/REVIEM/$$$call$$$/grid/files/review/workflow-review-revisions-grid/fetch-grid?submissionId=27&stageId=3&reviewRoundId=15& =1634951969470:1 Failed to load resource: the server responded with a status of 503 ()
/index.php/REVIEM/$$$call$$$/grid/users/stage-participant/stage-participant-grid/fetch-grid?submissionId=27&stageId=3&_=1634951969467:1 Failed to load resource: the server responded with a status of 503 ()
DevTools failed to load source map: Could not load content for https://ojs.aprenderenred.com.ve/lib/pkp/lib/vendor/tinymce/tinymce/skins/lightgray/skin.min.css.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE

There seems to be a lot of problems.
When and how did this problem arise?
What are your last actions?

Can you share the following lines in your config file?
locale = ?
client_charset = ?
connection_charset = ?
database_charset = ?
show_stacktrace = ?
display_errors = ?

Dear kerimsarigul:

I tell you that when accessing the PHP error_log file we found the following errors:

[27-Oct-2021 04:29:23 America/New_York] PHP Deprecated: Non-static method PKPApplication::getRequest() should not be called statically in /home/aprender/public_html/ojs/plugins/generic/registrationNotification/RegistrationNotificationPlugin.inc.php on line 54
[27-Oct-2021 04:29:23 America/New_York] PHP Deprecated: Non-static method Core::removeBaseUrl() should not be called statically in /home/aprender/public_html/ojs/plugins/generic/usageStats/UsageStatsLoader.inc.php on line 767
[27-Oct-2021 04:29:23 America/New_York] PHP Deprecated: Non-static method Core::_getBaseUrlAndPath() should not be called statically in /home/aprender/public_html/ojs/lib/pkp/classes/core/Core.inc.php on line 231
[27-Oct-2021 04:29:23 America/New_York] PHP Deprecated: Non-static method Core::removeBaseUrl() should not be called statically in /home/aprender/public_html/ojs/plugins/generic/usageStats/UsageStatsLoader.inc.php on line 767
[27-Oct-2021 04:29:23 America/New_York] PHP Deprecated: Non-static method Core::_getBaseUrlAndPath() should not be called statically in /home/aprender/public_html/ojs/lib/pkp/classes/core/Core.inc.php on line 231
[27-Oct-2021 04:29:23 America/New_York] PHP Deprecated: Non-static method Core::removeBaseUrl() should not be called statically in /home/aprender/public_html/ojs/plugins/generic/usageStats/UsageStatsLoader.inc.php on line 767
[27-Oct-2021 04:29:23 America/New_York] PHP Deprecated: Non-static method Core::_getBaseUrlAndPath() should not be called statically in /home/aprender/public_html/ojs/lib/pkp/classes/core/Core.inc.php on line 231
[27-Oct-2021 04:29:23 America/New_York] PHP Deprecated: Non-static method Core::removeBaseUrl() should not be called statically in /home/aprender/public_html/ojs/plugins/generic/usageStats/UsageStatsLoader.inc.php on line 767
[27-Oct-2021 04:29:23 America/New_York] PHP Deprecated: Non-static method Core::_getBaseUrlAndPath() should not be called statically in /home/aprender/public_html/ojs/lib/pkp/classes/core/Core.inc.php on line 231
[27-Oct-2021 04:29:23 America/New_York] PHP Deprecated: Non-static method PKPApplication::getRequest() should not be called statically in /home/aprender/public_html/ojs/plugins/generic/registrationNotification/RegistrationNotificationPlugin.inc.php on line 54