Thanks for the information, but i am using mac ios, what should i do?
thanks a lot!
regards,
ST
From your first post it looks like you are using a very old version of core (or qt as it was called back then). You should update to the latest version.
#1 create a backup of your wallet.dat (just in case)
#2 close core
#3 get the latest version
https://bitcoin.org/en/download#4 install it (just over the current version)
#5 start core to see if your balance is in order and everything else is correct. If there is some error, let us know.
if no error on #5
#6 close core
#7 start core with -zapwallettxes to remove the unconfirmed transaction. Since I have no Mac I cant give you a step by step, but you need to open the terminal and start
Bitcoin-cli -zapwalletxesthis may require the full path.
#8 let core rescan the blockchain for the TX that are already confirmed.
#9 wait at least 24 hours to create a new TX to avoid further issues.