The error indicates that it can’t find the kleo_vc_elem_increment function. That function has been around since before k-elements 1.6. Its located in k-elements/compat/plugin-js-composer/config.php on line 15. Sounds to me that either that file is missing or corrupted.
Can you verify that you are running
Kleo 2.1.1
K-elements 2.1.1
Visual Composer 4.3.4
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