After updating LearnPress to version 2.1.4.2 course page error

I was use 2.1.4 version of this plugin. I update it and now there is an error on the page. https://akademikistatistik.com/online-egitimler/spss-egitim-programi/ could you please check it? What is the problem? If there is no quick solution, how can I find version 2.1.4? Thanks.