@matheus-zarpellon, I hope you saved your commands.json file from before you formatted your PC. For extra security, the commands are only stored there, not on TRIGGERcmd servers.
If you're not subscribed, you can only have 1 computer in your account, so you'll need to delete your computer object before re-adding your computer to your account.
You might want to take a screenshot of the triggers so you'll know which commands to re-create.
I have only the same PC, I tried to start a new account, but the error is the same.
I tried to delete the .TRIGGERcmdData folder, but it didn't work too.