I'm wanting to make a paper wallet so tried generating a wallet on bitaddress.org.  Here's the result (obviously I'm not going to use this address):

Bitcoin Address:
1GEkrLo9F1NGosabvE3SiiP3PjkNsUZmre

Private Key (Wallet Import Format):
5HpYGkJXKBRk9YgkZFSLgHR9uXsSJUZS4pZm9NHYXjXSE2opMnv

I wanted to test importing it so tried importing the private key with Electrum via the GUI and I always get the following error:

"The following inputs could not be imported:
5HpYGkJXKBRk9YgkZFSLgHR9uXsSJUZS4pZm9NHYXjXSE2opMnv"

Is there a specific format I should be using? Also how can I specify the address?