So you have probably seen this message before
first thing don’t panic.. it is absolutely normal.
1- this message usually means that one or many of your plugins or themes or potentially your wordpress core is being updated
it will usually go back to normal after a few minutes.
The quick fix :
2 – if it does not please go to your main installation folder (that is where you can find wp-config.php) and delete a file named .maintenance
sometimes you can’t see it because in your file manager you have to check the ( show hidden files ) box as in the picture below :
for more information about this issue check out wordpress.org
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