Guru Light version hasn't been updated for years, it's not compatible with Joomla 4. Unfortunately we do not have plan to update this version further due to our high workload on the premium extensions.
We'd recommend getting the Guru Pro version so you can use all the features that Guru has to offer. Since you already have Jomsocial membership at the moment, you can choose to upgrade to Ultimate Developer to gain access to all products (including Guru Pro) at a discounted price. The upgrade offer is available at your member dashboard page.
Hope this helps.