Default Twitter call from template for social media contest not working

Your default 'Tweet this' script as appearing in your template for social media contests results in the following error, as per image.

"'Sorry something went wrong'
The client identifier was missing or unknown."

Perhaps Twitter have updated the api call with their 'new twitter' - could you clarify the issue and procide updated code? Everything else is working perfectly on the page (even the Facebook call), but the Twitter call fails every time, and I can't seem to pinpoint that script on the Twitter support site.

Thanks.

Source: http://getsatisfaction.com/unbounce/topics/default_twitter_call_from_template_for_social_media_contest_not_working

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