That's the issue; hardly any QT based wallets use BIP38 encryption for importing private keys anymore. Only WIF.

"Note that not many bitcoin wallet applications or web services are able to import BIP38 private keys. In this case, you will have to use the "Validate" feature on the generator to extract the unencrypted Wallet Import Format (WIF) key as an intermediate step before sweeping the balance."

https://bitcoinpaperwallet.com/bitcoinpaperwallet/generate-wallet.html

Click 'Skip', then click the 'Validate or Decrypt' tab. Copy and paste your private key into the blank field box, then click 'Validate/Decrypt'.

i think its one of the last 2.

 I haven t done it myself.  have to leave it for someone who has.

   oh, is your wallet encrypted.  (i think it needs to NOT be, but im not sure)

 i think someone can help you, with these details, just gotta wait for that.

Im going to ask questions.  make sure any answer does NOT include that private key.   again do NOT post that!

ok, Do you have the latest wallet?

   are you using the correct import key command. (check syntax etc)

are you typing in the privkey or copy paste from image?
  either...make sure every lettet/number is copied correctly.  (on upper/lower where it should be the other would screw it up)

also.. if your copying, an extra space at the end might screw it up.

  (yes, this is the basic things to check)

 (post your version of wallet here) and your command you are entering. (NOT THE PRIVKEY!)

so we can see.  maybe someone can help after that.

 Goodluck.