[Fechado] Internal 500 Error

Background of the issue:
I am trying to use my theme with WPML to have the pages translated to French. The issue can be seen at link oculto.

Symptoms:
Whenever WPML Multilingual CMS and WPML String Translation plugins are active and I attempt to navigate the site in the translated language, I get an Internal 500 Error: "Internal Server Error The server encountered an internal error or misconfiguration and was unable to complete your request. Please contact the server administrator at webmaster@pamci.info to inform them of the time this error occurred, and the actions you performed just before this error. More information about this error may be available in the server error log. Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request."

Questions:
Why am I getting an Internal 500 Error when using WPML with my theme?
How can I resolve the Internal 500 Error when WPML plugins are active?