Suddenly getting error in Wpbakey plugin/ Visual Composer - wordpress

I am wokring on a theme in wordpress which contains visual composer and it was working perfectly last day. But today when i am trying to edit the page using visual composer frontend it keeps on loading and in backed when i click on save button nothing happens. So i check the chrome console and fond this error. Any help will be appriciated and thanks in advance i am attaching the error below.
Uncaught TypeError: Cannot read property 'label' of undefined
at Object.defaults (frontend-editor.min.js:3)
at frontend-editor.min.js:7
at Function.m.each.m.forEach (load-scripts.php:97)
at Object.<anonymous> (frontend-editor.min.js:7)
at Object.getDefaults (frontend-editor.min.js:1)
at n.vcAddShortcodeDefaultParams (frontend-editor.min.js:1)
at _ (load-scripts.php:99)
at m (load-scripts.php:99)
at f (load-scripts.php:99)
at Object.u.trigger (load-scripts.php:99)

I am not an expert by any means but i have found the solution by myself so wanted to share the answer if it can help anybody. The problem was the PHP version. After I changed the PHP version of my server form PHP 7.1 to PHP 5.6 it solved the issue.

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