How To Fix Internal Server Error

 
To coordinate WordPress with your server, You need to do a few things.
This configuration will help you use WordPress and themes better.
Please read the bellow links:

Host configurations: To access these fields please edit “php.ini” file which is located in host (if you can’t find it then contact with your host service provider)
 

upload_max_filesize = 32M

post_max_size = 48M

memory_limit = 128M

max_execution_time = 600

max_input_vars = 10000

max_input_time = 400

WordPress Configurations

Reference

500 Internal server error causes from website’s server and it is not related to the theme. Read this article for more information.