Call to undefined function Collective\Html\is_iterable()

`(2/2) ErrorException Call to undefined function Collective\Html\is_iterable() (View: /home/finocoin/public_html/mocktest/Themes/themeone/views/exams/quiz/update-questions.blade.php)

in FormBuilder.php (line 741) at CompilerEngine->handleViewException(object(FatalThrowableError), 1) in PhpEngine.php (line 47)`

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