Magento does not show template

I can't figure out why magento is not loading my template:

The template is located at app/design/frontend/base/default/template/fekete/Newsletter2Go/customer/account/dashboard/info.phtml

I double checked its existence. It does exist on the server.

I executed these two commands to make sure that the permissions are correct:

find . -type d -exec chmod 775 {} \; find . -type f -exec chmod 664 {} \; 

then I ran

chown -R myuser:www * 

from the project root. I also cleared the cache. Nothing happens.

I also removed the content from the template and replaced it by this:

Test Test Test 

But nothing shows at all even though the template hints reveal that it should render.

UPDATE:

I found this in the log

Not valid template file:frontend/base/default/template/fekete/Newsletter2Go/customer/account/dashboard/info.phtml Not valid template file:frontend/base/default/template/fekete/Newsletter2Go/showOnAllPages.phtml