What is the difference between the two sentence in meaning?
Solution 1:
It is easy for you to solve this problem.
This indicates that you can solve the problem without difficulties - however, this does not mean that the problem itself is easy.
It is easy that you solve this problem.
This doesn't make much sense to me. You could possibly change it to You solved this problem! So it must be easy! indicating that now you've seen someone solving the problem, you think it must be easy to solve.