I had an error in my previous letter. Thus, I have prepared another one.
Have they constructed correctly, please?
"I had an error" is far less likely than "I made a mistake/error / There was an error". 'Thus' is not appropriate. It is better to say 'new letter' than 'another one' which could be interpreted as 'another mistake'.I had an error in my previous letter. Thus, I have prepared another one.
[STRIKE]Have[/STRIKE] Are they constructed correctly, please?