I hove put  the following statement in the Bitcoin.conf file:
prune=0

It is a "virgin" installation.  version 0.19.01

I have a dumpfile created with the previous Bitcoin version.
I am trying to import a dumpfile. I get the following error message

command:
importwallet "C:\Users\Ingvar\Desktop\WalletsDesktop\DumpedWallets\UsersAdministratorDesktopWalletsDesktopDBitcoinBUwallet.dat"

the dumpfile I try to import starts like this

# Wallet dump created by Bitcoin v0.18.1
# * Created on 2019-10-12T13:23:19Z
# * Best block at time of backup was 297837 (00000000000000001b230135c1b019c0959c89451f5af92bc2012192565f4c24),
#   mined on 2014-04-26T17:43:11Z

# extended private masterkey: xprv9s21ZrQH143K3CPuARCD5bADuDVs5zY6Vuh4YdmhhNUMgVRdJpytEzYuMr1qzTSY81G8Gwgyg4h MdLVZni5yNRBw629y1mcNb6DTPs9jqsm

KzTVZq6RQkTjntSqxwHpHVLmd8hxhkhKf3fxBxFTiy15hykFugQC 2019-10-12T09:40:52Z reserve=1 # addr=3MwTJm7ZMxnQYhAnQZxwpfHyAqUYBhJX6F hdkeypath=m/0'/0'/2'
L217y5pkjJamtxphbd1i95QUjPh8S7jFVuwo2uMvQhoG22Kr8TYj 2019-10-12T09:40:52Z reserve=1 # addr=37bKNqToKAUPWQPjXtmZJVNSVBdoDqZ9bC hdkeypath=m/0'/0'/4'



Get this error message:
"Error: std::bad_alloc"

Tried another dumpfile.  Same error

I tried to import a dumpfile from a local bitcoin instance to another new local  "virgin" instance. Got an error message:

Command: 

importwallet "C:\DumpedWallets\UsersAdministratorDesktopWalletsDesktopDBitcoinBUwallet.dat"


Response:

Importing wallets is disabled when blocks are pruned (code -4)

I have tried several times  Do not understand

Running windows 10 and bitcoin core latest version