Quite odd yet cryptopia is fully working on my side which I do able to logged in. Error 500 meaning do been already defined above but the case is totally different because such issue do only occurs in you, we do know if there are still others who do experience such error but the only one who can able to find out whats the problem is on cryptopia itself which you would really need to sent up ticket towards into your issue yet they are the ones who are capable on solving such problems.