Use Font and Emphasise at the same time

It seems that whenever I use setmainfont(Cochin), all the textbf{}, textit{} in the main text will just not work. Anyone know how to fix this? Thanks! I am not sure if it’s because of the font.

The following is a code black:

documentclass{article}
usepackage{amsmath}
usepackage{amsthm}
usepackage{amssymb}
usepackage{amsfonts}
usepackage{fontspec}
usepackage[dvipsnames]{xcolor}
setmainfont{Cochin}
begin{document}
textbf{Hi}
end{document}

setmainfont[Mapping=tex-text, Path = mention file path where you keep the fonts,
UprightFont= AdobeTextPro-Regular.otf,
BoldFont=AdobeTextPro-Bold.otf,
ItalicFont=AdobeTextPro-It.otf,
BoldItalicFont=AdobeTextPro-BoldIt.otf
]{AdobeTextPro}
settextfont{AdobeTextPro}