Hi there,

this is not a problem of the responsivizer template but of a third party extension, probably a module that is missing a file or a template override.

You should unpublish/exclude all modules from the mobile template one by one until you find the one causing the issue.

On Google you find some more resources even to compare known extensions throwing this problem with the ones you have installed:
https://www.google.com/search?ei=vrRiXPySLoqcsAeqzr3YBA&q=call+to+undefined+functions+wrap_with_tag+joomla&oq=call+to+undefined+functions+wrap_with_tag+joomla

If you find a module requiring a template override you can just copy it in the responsivizer template too.

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Best regards

John Dagelmore