Too much devices activated with the same id

I can't use anymore my book reader because each time  i try to match my adobe id with the app mlol, a red error says that too much devices have been  activated with the same id...

But it's not true!!!

I used only one app in the same device, but for many times I installed and disinstalled the same app untill was unusefull to subscribe the adobe id..

Please, solve this problem!!