Lost all my kakao talk contacts?

When I upgraded my iphone 4s on the computer kakao talk was deleted. I re-installed and I had all my contacts and everything. I recently had a problem with kakao that I had to delete and re-install and it deleted all my contacts. I do have an account with my email but I can't seem to get my contacts back. I don't understand what is wrong with this app!

When I changed my phone all I had to do was put my email in, and all my contacts were saved

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