Laravel:load() Error

[ankitnayan]

I tried OpenCensus in Laravel using
https://github.com/census-instrumentation/opencensus-php/tree/master/examples/laravel#integrating-opencensus

It throws error on Laravel::load(); line

opencensus extension required to load Laravel integrations.

Do I need to install anything else too?

Here is my composer.json file

[ankitnayan]

any help in this?