Wordpress TinyMCE broken (ERR_CONTENT_DECODING_FAILED): How to define TinyMCE in wordpress

Question

I recently moved my WordPress website. The site works fine but the admin does not load the TinyMCE editor. This disables me from editing text.

Here is my console simplified:

GET domain/wp-includes/js/tinymce/wp-tinymce.php?c=1&ver=4310-20160418 net::ERR_CONTENT_DECODING_FAILED

Uncaught ReferenceError: tinymce is not defined
Uncaught ReferenceError: tinyMCE is not defined
Uncaught ReferenceError: tinymce is not defined

Here is the extended version:

 GET ..domain/wp-includes/js/tinymce/wp-tinymce.php?c=1&ver=4310-20160418 net::ERR_CONTENT_DECODING_FAILED (post.php?post=100&action=edit:2844)

Uncaught ReferenceError: tinymce is not defined(anonymous function) @ post.php?post=100&action=edit:2846

    Uncaught ReferenceError: tinyMCE is not defined(anonymous function) 
    @ wp-langs-en.js?ver=4310-20160418:235(anonymous function) @ wp-langs-en.js?ver=4310-20160418:519
    post.php?post=100&action=edit:2841 


Uncaught ReferenceError: tinymce is not definedload_ext @ post.php?post=100&action=edit:2841(anonymous function) @ post.php?post=100&action=edit:2851

It would be great help if someone can tell me if I can manually define TinyMCE.

Console

muhammed celik muhammed celik · Accepted Answer · 2019-02-11T22:20:13

It's a common error. Probably you have tinymce.js in specified path in wp-includes. But some reasons cause to prevent load tinymce.js . tinymce.js is loaded by tinymce.php and tinymce.php includes this logic:

if ( isset($_GET['c']) && 1 == $_GET['c'] && isset($_SERVER['HTTP_ACCEPT_ENCODING'])
    && false !== stripos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') && ( $file = get_file($basepath . '/wp-tinymce.js.gz') ) ) {

    header('Content-Encoding: gzip');
    echo $file;
} else {
    // Back compat. This file shouldn't be used if this condition can occur (as in, if gzip isn't accepted).
    echo get_file( $basepath . '/tinymce.min.js' );
    echo get_file( $basepath . '/plugins/compat3x/plugin.min.js' );
}

There is a compressing error most probably, something prevents your WordPress to compress tinymce.

In my case, I solved this error by disabling LiteSpeed Cache. LiteSpeed Cache doesn't work in my hosting plan so it causes compressing problem at wordpress loading.

Hope this answer helps others.

Wordpress TinyMCE broken (ERR_CONTENT_DECODING_FAILED): How to define TinyMCE in wordpress

1 Answers