A new method -
getEntityNameLowerCase
has been added to address the template error -
get_entity_name
not available.
This issue is related to a XenForo bug reported at
Fixed - Breaking change in XenForo 2.3.7 in getter syntax that will be resolved in version 2.3.8.
Meanwhile, please apply this package and install the latest version of the affected add-on to resolve the error.