drupal_substr() and drupal_strlen() have been removed from unicode.inc in the latest D8 beta. Presumably they should be replaced by the mb_xxx equivalents.

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webflo’s picture

webflo CreditAttribution: webflo at UEBERBIT GmbH commented
Status: Active » Fixed

We fixed this issue in #2258491: Create drupal 8 version of field_group

webflo’s picture

webflo CreditAttribution: webflo at UEBERBIT GmbH commented

Status: Fixed » Closed (fixed)

Automatically closed - issue fixed for 2 weeks with no activity.