Importprivkey problem for Litecoin clone
It seems like you are trying to import an address with importprivkey, which is absolutely incorrect. An address is not a private key and thus cannot be imported with importprivkey. Addresses have different data and will have different prefix letters than private keys. Looking at your code, the prefix for private keys will be 2 and those should be able to be imported into your wallet IF they did not already exist in the wallet (i.e. import to another wallet). This has nothing to do with your address prefix.