Why this problem occurs?

• Your extension may be corrupted or they may left out some files like incomplete. So safeguard your site its better we can avoid using these kinds of extensions without again trying to install.
• Another way why this problem occurs is your hosting server might have a problem with the zip if you are trying to install the zipped extensions. To fix this you can follow the possible method 

            1.   Extract your zipped extension in your local machine & upload it to the online server using Ftp.
            2.   After that use the option Install the extension from the directory on your server. In joomla, we can select it easyily tat via standard install extension interface.

Now your problem is fixed.

A simple tip from
Ultimatecine.com