Can’t figure out this mistake

Hey, this mistake often happens to me… Here (in red) I placed this two, and it counted as an error, even if there wasn’t any two neither in the 9 zone, or in the line, or in the column. Am I dumb? Please help.

Hey, this mistake often happens to me… Here (in red) I placed this two, and it counted as an error, even if there wasn’t any two neither in the 9 zone, or in the line, or in the column. Am I dumb? Please help.