With the latest update to beta6, it appears the module gained a dependency on the "String translation" module, which is not documented in the module itself.

This causes fatal errors such as the one below if the module has not been enabled for other reasons.
PHP Fatal error: Call to undefined function i18n_string_translate() in sites/all/modules/metatag/metatag.module on line 1761

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damienmckenna’s picture

damienmckenna
Location TN, USA
commented
Status: Active » Closed (duplicate)

Thanks for the bug report.

This was reported and fixed earlier today: #1971406: Incorrect calling of i18n_string_translate function

I'll have beta7 out probably tomorrow with this fix.