Receiving An unexpected error occurred message

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When activating the Bethel theme I get the following message and not access to any pages.

An unexpected error occurred.
Call to undefined method Concrete\Package\DsBethel57\Theme\Bethel\PageTheme::getClassSettingsPrefixString()

Type: Pre-Sale
Status: New
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concrete5 Environment Information

Concrete5 v8.3.2

Browser User-Agent String

Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:58.0) Gecko/20100101 Firefox/58.0

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