Problems with enabling extra tab in module to build tabs

Installed your Extra Tabs Pro module and added new tabs. Unfortunately I cannot activate them. I have tried clicking on the button and also dragging it to the right as in your video, still nothing.


There are two possibilities. I will describe them shortly below:
  1. Most common problem is fact that file /modules/extratabspro/ajax_extratabspro.php is not accessible from browser. This usually is related to privileges (chmods) that you granted for one part of the path:


    if one part of the path will have privileges not accepted by your hosting - the effect will be inaccessible ajax_extratabspro.php file (500 error).

    What causes 500 Internal Server Errors?
    Here are the three most common reasons:
    Incorrect file permissons - Most commonly having a file as "world" writeable. This is a very common issue with PHP files. In general on our servers, PHP file permissions should not be higher than 775. Keep in mind too that the permissions of the parent folders/directories need to be set correctly too. See our File Permissons article for more information, including how to change those permissions.
    Leaving file permissions set incorrectly - after manual installation of content management systems, forums, blogs, etc.

    Proper permissions are related to hosting environment. Some of hosts accepts 777 chmod, some of them not. Do a research in your host faq file and search for information about accepted chmods by your host operator.
  2. Second most commpon problem is related to fact that you're connected to your shop back office with wrong domain address which is not equal to your shop domain. for example - your shop address is - if you will connect to shop back office with address http:// - all ajax queries in back office will not work. The same if you will use for example instead (fromc technical point of view domain with www is not the same as domain without www)
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