problem.. I mined some denarius in 2015 .i saved the denarius folder located in appdata-roaming of the denarius local wallet i had in 2015 on a flash pen. now i have installed the new wallet on another pc.then i have replaced the new wallet.dat with the old wallet.dat. when i run the  wallet i get this error: when i click ok on the message the wallet terminates.
what can i do?
was it the old denarius coin?