1. Stylsheet is missing
  2. 404 error on post type page

First off, be sure that your WordPress installation, themes and plugins are up to date.

‘Broken Theme’ and ‘Stylesheet Missing’ Issues

A common issue that can occur with users new to installing WordPress themes is a “Broken theme and/or stylesheets missing” error message being displayed when trying to upload or activate the theme.

First, you can check the installation instructions in the documentation contained in your theme package.

Be sure to do NOT install the whole package.

Usually, the package downloaded on themeforest  is named (e.g : ).

First, extract this archive pack anywhere on your computer using an archiver (winrar, winzip etc…).

Inside this package you will find the theme folder to install: themename (e.g : ergo), and the “Documentation” folder.

You can upload the theme folder directly through FTP or you can compress it with winrar or another archiver as zip file and install it in the WordPress admin.

You can also check this link.

Why using FTP is better?
The reason why I encourage to install themes via FTP is for the eventual future updates.
If you have to update the theme, you will see that it will be much more convenient to use FTP to replace all the theme files.
This way you won’t have to re-install the theme through WordPress from scratch and re-activate it for each update.

I got a 404 Error

90% of the time, if you have someting wrong related to your permalink structure, for exemple, if your custom types show a 404 error, there is simple thing to do to fix this:

Go to your wordpress settings -> permalinks and re-save your permalink structure.

If you still encounter errors with your permalink stucture, it may be related to your server. Be sure that you hosting service provide the mod_rewrite PHP extension.

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